Well at 70mph(85 on speedo) its right around 5000rpm + or - some changeHow high are the rpm's on the highway?, say at 70mph with that 42T sprocket!
You've been saying some weird things lately. First off the 51 is not "lazily loping along" at 70mph in 6th with a 15/42 setup. I don't know if you've ever done the 15/42 cause I've only read that you have 15/41 but you'd be surprised what that one extra tooth will do. Before with stock gearing I would have to downshift into 5th sometimes 4th to make a pass. Now I don't I can leave it in 6th with no problems. And 4K rpm and above are this bikes sweet spots. What your failing to mention is that with the gear change your going to reach the higher rpm's quicker. And why in the world would you just run it up to 8K in 5th then make the switch? This bike makes power all the way to redline. Run it up to 10K rpm and then make the switch.So either way, the RC51 will be lazily loping along at those speeds in 6th.
At 70 MPH in 6th, the RC51 is barely in the torque range and not even in the HP band.That's not until 100 MPH and 6000 RPM.
Need to make pass on the freeway? Drop it down to 5th and run it up to 120 MPH (8000 RPM), hit 6th and keep on rockin' up to 155+.
All the while hearing those pipes booming. I love it.
It all boils down to what kind of terrain you ride on.Im just orderd 15T/41T,..Im wondering if I should of gone with a 42T????
mostly street riding!
Thanks for the info. subsailor!, I live in central ohio and its pretty flat with alot of highways also. I'll just try this for awhile and if i dont like it i'll just swap a 42 on there!It all boils down to what kind of terrain you ride on.
Here in Florida, it's flat with rural roads and highways.
For me, the 15/41 combo works. More than enough top end on the highway to land me in prison, yet I have no problems through the twists and turns on the rural roads. I use 2nd through 6th in the course of that ride.
My RPMs generally range in the 4000-8000 range since I'm just out to have nice ride while trying to maintain fuel consumption.
Now if I was at the track, it's different. I may change the ratio to 15/42 or even 43 if it needed it to allow the bike to just hit the rev limiter at the end of the longest straight.
Now if you live in the mountains, or your roads are predominately tight and twisty, then maybe a 15/42 may allow the bike to stay in it's power range better through the gears.
Try it and if it doesn't work, change it.
You might be able to get by with a 15/42 without chain length issues.I've read somewhere you can go to a 42 T rear without changing the chain. If you drop the front to a 15T, can you still keep the chain and do a 43T?