Searched the forum best as I can as I know this topic has been dealt with in the past, but my computer illiteracy has come to the fore
Ok here goes, I have the '05 SM currently with 13000km on the clock ( 8100 miles ) and have finally decided that the ratios are just not doing me any favours with the gearing. I get about 4000 rpm when cruising at 100 km/hr ( 62 mph ) and after the few snippets I have read here I am keen to go up a few teeth on the front.
I have two questions -;
firstly has anyone got the 19 tooth and if so what rpm does it sit at for 100km/hr. I have read that the 18 tooth gives approx 4000rpm at 130 km/hr so that is a good guideline for me there, just want to see how much further it drops with the extra tooth. I used to have a web link that you could punch in all these numbers to get a perfect self preference ratio.
Secondly with going up in size I will throw on a new chain, I know its best to replace everything at once but that back sprocket is like new..... should I replace that too ??
( I know the answer will be yes but I just need that push from being too tight with the $$$ and properly maintain the thing
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