 Sprocket Question
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I'm thinking I will upgrade the sprocket up to a 19 right out of the gate when I get the Speedy. Seeing that I intend this bike as a cruiser on the highway and have my Bonnie for the twisties, I want something that will even her out going at a constant speed over a period of time. What kind of RPMs are you guys running with a stock sprocket at 80 mph versus a 19 tooth at the same speed? How many links had to be added to the chain when you went up to the 19?
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Re: Sprocket Question
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Loquacious
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Loquacious
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You won't have to add or subtract any links from the chain using anywhere from a 16 to 19 tooth drive sprocket. Assuming you are using an 18 tooth now, going to a 19 tooth should lower your rpms by 300/400 rpms at 80 mph.
12 Rocket Roadster
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Re: Sprocket Question
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New Tires
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I changed mine out to a 19 last fall for a long trip. It made highway speeds more enjoyable, lowered rpms about 500 and really cut down on vibrations at high speed. I don't look for that sixth gear anymore, it's still installed. I ride mostly around town here in KC and it hasn't been a problem at all in traffic. The only down side is that I don't drag HDs anymore.
Every normal man must be tempted, at times, to spit on his hands, hoist the black flag, and begin slitting throats.
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Re: Sprocket Question
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Oil Expert
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I know I still looked for a 6th gear with an 18t on, and lost a lot of top-end grunt, too. The lower RPMs aren't all that, Bro. These engines are built for high RPMs, and are smooth enough to be able to enjoy it.
I just went back to the stock 16t front my Speedy came with, and I'm loving it. I'm seeing 100mph a lot more now, and getting there a lot faster (that's why I'm seeing it more), and having a blast blowing through traffic around Houston here. Not that I ride everywhere at 100 mph (more like 85), but when I get on the on-ramp, and twist, there it is, in a hurry!
And my gas mileage is better too, because the engine isn't straining at lower rpm's trying to push the taller gear.
The BUZZ is back!
Keith
Houston
Ridin'Texas
'04 Speedmaster
AI removed, Pingle, UNI Filter, 1 shim, straight-through slash-cut TORs, Stage 1 DynaJet, 140 mains, 3 turns, 16/42 final drive, 115K
2020 T120 Black
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Re: Sprocket Question
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Bar Shake
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Bar Shake
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With the stock 16t front sprocket, I'm turning 5,000rpm at 80mph (indicated). With a 7900 rpm rev limit, it's just into the power.
No way I would downgrade to a higher ratio. At least not without about 50 more ft lbs of torque.
(Caveat):
I suppose that if you intend on riding straight lines on the slab all the time it might be practical to go with a higher ratio.
Contra todo mal, mezcal; contra todo bien, tambiƩn
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Re: Sprocket Question
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I changed from a 16 to a 17. The difference was about 5 mph- the rpms at 70 on the 16 were the same as 75 on the 17. Definitely noticed a difference on the low end pulling out but nothing I didn't get used to after a few rides. The 17 is perfect for me as I don't want to give up any more low end. Someone on the Triumphrat.net site has a rpm calculator spreadsheet that seems to be right on.
2005 Speedmaster, Tornado Red, AI removed, Uni Pods, JCW 19" turnouts
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 Re: Sprocket Question
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Loquacious
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My 2 cents. I have a 16T and like the acceleration it gives. The engine turns 6000 rpm at 100mph. It gets about 32mpg at this speed. It will keep this up as long as you can avoid the cops. 
Steelheart- '03 Speedmaster Black/Yellow
The Hayabusa Killa
16" Shorties/140 mains/Airbox drilled
Procom CDI
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Re: Sprocket Question
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New Tires
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All these comments are legit. I think it has a lot to do with personal riding style and use. The sprockets are cheap and it only takes about 20 minutes to change out. Just experiment.
I must say that my bike is a 03 TBA, smaller engine. The last trip was to BaxterCycle in Marne Iowa, a little under 190 miles. We averaged 85.3 miles/hr on the way back, per stop watch and actual miles. About 60% was slab, the other two lane. We stopped once for fuel and slowed to the speed limit for numerous farm towns. Yes, we had radar detectors.
Trumpeteer like your Bonnie I have a Thruxton for the twisties.
Last edited by MACMC; 07/10/2010 1:05 PM.
Every normal man must be tempted, at times, to spit on his hands, hoist the black flag, and begin slitting throats.
H. L. Mencken
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Re: Sprocket Question
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Complete Newb
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Complete Newb
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With standard gearing my 09 lopes along at 75mph at 4000RPM. Try this site to work gearing out. http://www.gearingcommander.com/
When there is no peril in the fight there is no glory in the triumph.
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Re: Sprocket Question
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This is some great information; thanks for sharing with me on this. Seems like I might just have to ride the bike for a while when I first get her to figure it out. It seems that these engines run a little lower RPMs than what I am used to on my Bonnie. I wonder if that is due to the 270 engine versus the 360?
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Re: Sprocket Question
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Fe Butt
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Fe Butt
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I'm with Bill and Brian, love my 16T sprocket. The engine is happy at the 5,000 RPMs more or less I hold it at on my long rides. Getting ready to ride it to Fl in a couple weeks and no thoughts at all of changing the sprocket.I have a 19T hanging on my wall that I put on then took right back off again. Lost too much low end TQ. My SM will have it's 16T the rest of it's days.
I learned all I need to know about life by killing smart people and eating their brains.
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Re: Sprocket Question
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It must be something to do with the 270 span; my RPMs are much higher on my Bonnie than the numbers you guys are throwing out to me. If I can keep it under 5grand then I most certainly will leave it the heck alone and just run stock.
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Re: Sprocket Question
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Fe Butt
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I don't think 16T is stock anymore. On your Bonnie what is the number of teeth on your back sprocket? My SM has 43 teeth if memory serves.Also over all tire dia. makes a difference.
I learned all I need to know about life by killing smart people and eating their brains.
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Re: Sprocket Question
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Quote:
All these comments are legit. I think it has a lot to do with personal riding style and use. The sprockets are cheap and it only takes about 20 minutes to change out. Just experiment.
Agreed. The front sprocket is quick and easy to change out and inexpensive. Personally the bike feels too "buzzy" for my liking at 5000 rpm for an extended ride.
2005 Speedmaster, Tornado Red, AI removed, Uni Pods, JCW 19" turnouts
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Re: Sprocket Question
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Quote:
I don't think 16T is stock anymore. On your Bonnie what is the number of teeth on your back sprocket? My SM has 43 teeth if memory serves.Also over all tire dia. makes a difference.
43 is the stock rear sprocket, 18 on the front. I believe there are differences with the stock sprockets on the Triumphs:
Bonnie T100: 18
Bonnie standards: 17
Thruxton: 17
America/Speedmaster: 16
So if we are going by sprocket size, then it would seem that the Bonnie should have the lower rpm at high speed than the America/Speedmaster but it seems just the opposite is true.
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Re: Sprocket Question
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Bar Shake
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Bar Shake
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Stock rear for BA/SM was 42, that's what mine is.
A 43 rear would go nicely with the 16 front.
Note: The Bonneville rear is not interchangeable with the BA/SM rear.
Contra todo mal, mezcal; contra todo bien, tambiƩn
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Re: Sprocket Question
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Yes, my stock SM set up was 16/42. I like the 17/42 better.
2005 Speedmaster, Tornado Red, AI removed, Uni Pods, JCW 19" turnouts
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Re: Sprocket Question
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I have a stock ba with the 18t.. I like it for everything except starting out in 1st....I'm thinking 17 when the time comes for a new sprocket and chain... V.
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Re: Sprocket Question
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I live in the sun downunder
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I live in the sun downunder
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Quote:
I changed from a 16 to a 17. The difference was about 5 mph- the rpms at 70 on the 16 were the same as 75 on the 17. Definitely noticed a difference on the low end pulling out but nothing I didn't get used to after a few rides. The 17 is perfect for me as I don't want to give up any more low end. Someone on the Triumphrat.net site has a rpm calculator spreadsheet that seems to be right on.
It was me that posted the spreadsheet on the Triumphrat forum.
It;s a simple spread sheet where you enter your tyre sizes and sprockets and it tells you what revs you get at a certain speed.
If anybody wants a copy, send me your email address to frankandjoanna@hotmail.com and I will send you a copy.
It's in Excel format.
I would post it on this Forum but I don't think I can.
Last edited by FrankW; 07/13/2010 3:27 AM.
FrankW
Ex Speedmaster rider, went to the Dark Side now riding an America.
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Re: Sprocket Question
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New Tires
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A stock 03 America has a 17 tooth sprocket, I thought when the Speedmasters came out they had a 16 tooth. Both had the smaller engine
Every normal man must be tempted, at times, to spit on his hands, hoist the black flag, and begin slitting throats.
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Re: Sprocket Question
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Someone correct me if I'm wrong, but I thought all the Americas and Speedys had 42 tooth rear sprockets. The early years (02-06), the Speedys had a 16T front and the Americas has a 17T. After they both had the the same 865 engine, I though they went to 17T.
I thought later versions have the 42 rear but 18T front sprockets. This has come up a number of times, but other than the early years, I'm not positive what they came with.
Bob
2005 America, 904cc - sold. 2014 Trophy SE.
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Re: Sprocket Question
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2006 came with 18 front and 42 rear,
you could try a suzuki sprocket to get more teeth for the rear, bolt holes are the same distance apart, but the triumph center is smaller then the suzuki.
Ć¢ā¬ÅThere is no heaven, there is no ******, except here on Earth.Ć¢ā¬Ā
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Re: Sprocket Question
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I live in the sun downunder
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I live in the sun downunder
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Quote:
Someone correct me if I'm wrong, but I thought all the Americas and Speedys had 42 tooth rear sprockets. The early years (02-06), the Speedys had a 16T front and the Americas has a 17T. After they both had the the same 865 engine, I though they went to 17T.
I thought later versions have the 42 rear but 18T front sprockets. This has come up a number of times, but other than the early years, I'm not positive what they came with.
My 2004 Speedy came with a 42 rear and a 16 front.
FrankW
Ex Speedmaster rider, went to the Dark Side now riding an America.
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Re: Sprocket Question
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Quote:
you could try a suzuki sprocket to get more teeth for the rear, bolt holes are the same distance apart, but the triumph center is smaller then the suzuki.
It looks like SuperSprox carries different rear sprockets for our bikes:
SuperSprox
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Re: Sprocket Question
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Fe Butt
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Fe Butt
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Quote:
Quote:
you could try a suzuki sprocket to get more teeth for the rear, bolt holes are the same distance apart, but the triumph center is smaller then the suzuki.
It looks like SuperSprox carries different rear sprockets for our bikes:
SuperSprox
I didn't see where it comes right out and tells you the materials. From what I read I gather that it is an aluminum sprocket with steel teeth outer ring, is that correct?
I learned all I need to know about life by killing smart people and eating their brains.
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Re: Sprocket Question
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Quote:
I didn't see where it comes right out and tells you the materials. From what I read I gather that it is an aluminum sprocket with steel teeth outer ring, is that correct?
That's what I gather. The way they don't give details seems like they're hiding parts made out of unobtanium or kryptonite or something.
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 Re: Sprocket Question
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Get the stock rear 42t from Triumph, or from FastEddie, unless you really want to change to more or fewer teeth. Stock fronts on all 790cc Speedies should have been 16t. Americas had 17t fronts, and they all had 42t rears. I took off my 16t at 7k miles, and did not really "know" how to ride yet, then. But I liked it. The 18t made more sense for highway speeds, but in reality, other than dropping rpms down a little, performance also suffered, although it was nothing to complain about. I don't think you could ever tell until you have ridden the taller gear for a while, and then go back down. Then you realize what you've been missing. You miss out on alot of grins in top gear up in that rev range. It is very satisfying. 58k later, and back to the 16t, running upwards of 5k, even 6k rpm in 5th gear, with no fear of running out of steam until speed reigns you in. There is a lot of power there to be exploited in that rev range. I cracked 65k miles last night, and I can not ever remember ever being any more pleased with my Speedmaster than I am right now. It's like flying in the Air Races every time I get on. And I won't see reserve until well over 140 miles. That tells me she's happy. I have another oil sample report due soon - I sample at each oil change. She's not wearing out any time soon.
Keith
Houston
Ridin'Texas
'04 Speedmaster
AI removed, Pingle, UNI Filter, 1 shim, straight-through slash-cut TORs, Stage 1 DynaJet, 140 mains, 3 turns, 16/42 final drive, 115K
2020 T120 Black
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Re: Sprocket Question
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Quote:
58k later, and back to the 16t, running upwards of 5k, even 6k rpm in 5th gear, with no fear of running out of steam until speed reigns you in.
There is a lot of power there to be exploited in that rev range.
I cracked 65k miles last night, and I can not ever remember ever being any more pleased with my Speedmaster than I am right now. It's like flying in the Air Races every time I get on. And I won't see reserve until well over 140 miles. That tells me she's happy. I have another oil sample report due soon - I sample at each oil change. She's not wearing out any time soon.
This is exactly what I like to hear and know that the SM is the right choice for me. I know that these bikes are more than capable with doing a long haul as I have done some touring on my Bonnie. The only difference is that the Bonnie is not comfortable when you tour going two up. My son and I will be doing a special tour when I go on my terminal leave from the service in a couple of years. The route so far is to start at the Statue of Libery then go to Toronto, on to Sudbury, then Thunder Bay, then Winnipeg, then Calgary, and finish Canada off at Vancouver. From Vancouver we head south to Seattle, cross Washington into Coure d'Alene. We hit Yellowstone and then on to Mt Rushmore and then off to see family in northern Missouri. From there we head east through Illinois and Indiana and rest in Columbus where I lived a couple of years before going into the service. Then off to the football hall of fame as it would be a sin to roll through Ohio and not see that. We then roll south to hit D.C. and finish our trip heading up to Lady Liberty herself. I think the Speedie will suit us very well and I am very confident with this p-twin engine. I have no doubt my Bonnie could do this and probably would do so if I was by myself but I think this kind of riding going two up on a Bonnie would not be very comfortable for the rider or the passenger. That is why I was asking the sprocket question but I think I will leave it alone and run her for a little bit to see...seems like she will do fine just as she comes stock.
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Re: Sprocket Question
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Fe Butt
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Fe Butt
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Yellowstone was way cool and so was the ghost town/museum in Cody. I found Mt. Rushmore blah, just another statue but bigger.
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
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Re: Sprocket Question
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Should be Riding
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Should be Riding
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Quote:
I found Mt. Rushmore blah, just another statue but bigger.
I thought Rushmore was pretty cool, but Crazy Horse was absolutely incredible...
Always remember to be yourself. Unless you suck. Then pretend to be someone else.
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Re: Sprocket Question
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Fe Butt
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Fe Butt
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I was at Rushmore about 25 years ago so there was no Crazy Horse. Just looked it up and it looks like it would be cool.
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
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Re: Sprocket Question
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Should be Riding
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Should be Riding
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it was there then, the project started in 1948
Always remember to be yourself. Unless you suck. Then pretend to be someone else.
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Re: Sprocket Question
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Fe Butt
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really? I don't remember seeing it.
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
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Re: Sprocket Question
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Should be Riding
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Should be Riding
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well, it took 60 years just to finish the face...
Always remember to be yourself. Unless you suck. Then pretend to be someone else.
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Re: Sprocket Question
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New Tires
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Crazy Horse is not at Rushmore, but down the "road" . I was there about 15 years ago and without the brouchure you couldn't really tell what was going on. What is amazing is that the same family that started the project is still blasting away. I think they're on the third generation. Those Pols are hard headed and determined, that's why we love them. Only in America!
Every normal man must be tempted, at times, to spit on his hands, hoist the black flag, and begin slitting throats.
H. L. Mencken
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Re: Sprocket Question
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Loquacious
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Since the "sprocket" theme of this thread seems to have run its course;
I find it interesting that a Sioux that abhored being photographed is now the subject of a statue. Not good for his soul.
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Loquacious
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hey matt, while in ohio you should take the time to check out the ama hall of fame museum in pinkerton, lots of nice bikes to see there
ENJOY!!!!! NEWT!!!!!
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Re: Sprocket Question
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Should be Riding
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Should be Riding
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Quote:
Since the "sprocket" theme of this thread seems to have run its course;
I find it interesting that a Sioux that abhored being photographed is now the subject of a statue. Not good for his soul.
it's true that there is no known photo of him, and Korczak started work with only a 3rd hand description of his appearance...
Always remember to be yourself. Unless you suck. Then pretend to be someone else.
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Re: Sprocket Question
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Should be Riding
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Should be Riding
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Quote:
Crazy Horse is not at Rushmore, but down the "road" .
yeah, I didn't mean to make it sound like they were close together, Crazy Horse is just outside Custer SD
Always remember to be yourself. Unless you suck. Then pretend to be someone else.
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Re: Sprocket Question
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Fe Butt
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Fe Butt
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I was wondering how I could have missed something so big if it was right there.
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