Oh, man, am I the Subject Matter Expert
on this one? I don't know if I can handle the pressure! First
, read this thread: viewtopic.php?f=25&t=44670
Good read, right? Okay, here's my assessment: I ordered my 2015 cT
with the 3.89:1 final drive ratio because I ride almost exclusively on-road, in pancake-flat Virginia Beach, which is Virginia's largest metropolitan area (lots of highways and interstates
). I've had it on the road for sixteen months and 22,000km (it's my daily driver
), and I routinely blast down the highway at 70mph.
I've had the bike up to a GPS-indicated 82mph on a slight downhill and topped out at 79mph on a flat stretch during a windless day (and immediately blew a head gasket; don't know if it was related, but I'm assuming it was
The particulates in the engine, transmission, and final drive oils during the 20k service looked great, giving me no indication that there's any kind of internal issues. Following the 20k service, the cT
has been running fine.
While the bike will cruise at 70mph, I cannot. The vibration is fatiguing. The engine is definitely not in it's comfort zone. Also, there is absolutely no passing power at that speed. Often, I'll come up behind a vehicle and attempt to pass, but it's "air wake" will be sufficiently strong enough to hold me back, forcing me to drop back behind the vehicle. Hills will quickly bleed off speed, as well.
Also, as an aside, it's awkward riding with a group of 4.62:1 ratio Urals, because they cruise at their comfortable engine RPM, which is invariably either too low or too high for my 3.89:1 ratio. It seems the tall final drive just exacerbates the already wide spread between the four Ural gears.
SO, in conclusion, CAN you cruise at these high speeds for a sustained period of time? Yes, but it's not enjoyable. The whole experience is MUCH more enjoyable around 60mph or so. That being said, I feel that my gearing choice was a wise one, given the type of riding I do and my riding environment.
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