less weight = more speed.

2017 Tri Street Cup 900, 440 lbs. 55 Hp, 59 Ft lbs torque
2017 HD 883 Iron, 540 lbs. 52 Hp, 53 Ft lbs torque
*** I guessed on the Harley HP, not something they like to talk about or put in the spec sheet***

If you look at the Triumph website the only 17 model year cruiser listed is the Rocket.
No Birds, No Speedys No Muricas


It's not speeding till you get pulled over.
https://www.youtube.com/watch?v=Bqa1s4jhkQ8