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Old 12-11-2011, 02:51 AM   #41
Snarky
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Quote:
Originally Posted by nihaikitty View Post
ok, so I read about that somewhere else too, what does "torque over" mean?
I've never heard of torque issues with bikes and shafts. I mean, I guess it's theoretically possible, but either your engine or rear suspension would have to twist I would think. Which I don't think most motor mounts or rear suspensions have enough play in them to do this.

Generally on high power shaft driven vehicles, the torque being passed through the vehicle to the wheels is so great that it actually causes the frame of the vehicle to twist. See: a loaded 18 wheel accelerating. The whole front of the truck twists with engine torque, because the frame is designed to do so.

On a bike, I wouldn't think so. Bike frames seem to be fairly rigid for their power, and the drive shaft doesn't usually run down the middle of a bike to allow such a torque to act on the bike as a whole, just the over torqued parts. see: BMW final drive explosions.
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Old 12-11-2011, 04:58 AM   #42
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You don't get twisting, but you do get shaft jacking, which causes the rear to rise on accelleration.. some worse than others. The Concours has probably the best design so far as limiting the chassis reaction to the shaft.

Only sport bike I know of ever had a shaft was the 2-year Yamaha Seca 900.. I miss mine.
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Old 12-11-2011, 11:02 AM   #43
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honorsdaddy summed it up on page 1.

Chains are plenty durable, adjustable, light weight, noisy.

Performance driven sport bikes will never use shaft drive, they're too heavy and bulky. They work well for the applications they are currently used for, power delivery is good, maintenance is nearly non-existent, quiet.

I don't know much about Belt drive, they seem very reliable but again the chain seems like it works the best for weight total and adjustability on the fly.
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