do rotors and sprocket need to be on the wheel to balance? - Triumph Forum: Triumph Rat Motorcycle Forums
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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 05-14-2010, 08:06 AM   #1 (permalink)
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do rotors and sprocket need to be on the wheel to balance?

that sums it up... do i need to put the rotors and the sprocket back on my wheels before they get balanced, or are they close enough to the center that it wont matter?
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Old 05-14-2010, 08:42 AM   #2 (permalink)
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I don't know the official answer, but I know that both of my wheels have been balanced with rotors and sprocket attached.
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Old 05-14-2010, 10:42 AM   #3 (permalink)
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Ideally yes. But the sprocket might not stay on during balancing on account of it not actually being fastened to the rim.
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Old 05-14-2010, 10:44 AM   #4 (permalink)
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I would imagine the answer is yes, they would need to be on there. Anything that could potentially change the way the wheel is balanced before it goes on the bike should be on the wheel when it is balanced so that it is taken into account.

if the sprocket or rotor is not perfectly balanced, then when you mount them it will throw the balance of the wheel off as well. It makes sense to have it all put together and balance it as a single unit.

Whether or not this is the "right" way by the manual I couldn't tell you, but if my mechanic balanced my tire without the rotor or sprocket, I'd make him rebalance it to make sure it is still correct.

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Originally Posted by marc hanna View Post
Ideally yes. But the sprocket might not stay on during balancing on account of it not actually being fastened to the rim.
Then what IS it fastened to? (I consider the hub to be part of the rim)
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Old 05-14-2010, 10:53 AM   #5 (permalink)
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Quote:
Originally Posted by hobbes80 View Post


Then what IS it fastened to? (I consider the hub to be part of the rim)
It just sits in place. The cush usually provides just enough grip so that it doesn't fall out when you remove the rear wheel, but if you jar it a little, it will fall right out. It's the axle and swing arm that hold it in place when on the bike.
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Old 05-14-2010, 11:18 AM   #6 (permalink)
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Quote:
Originally Posted by marc hanna View Post
It just sits in place. The cush usually provides just enough grip so that it doesn't fall out when you remove the rear wheel, but if you jar it a little, it will fall right out. It's the axle and swing arm that hold it in place when on the bike.
on the thruxton, the sprocket bolts to the hub, as does the disk/rotor.
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Old 05-14-2010, 11:26 AM   #7 (permalink)
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So the Thruxton doesn't have a cush drive?
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Old 05-14-2010, 11:31 AM   #8 (permalink)
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Actually, just looking around some other threads, and it appears the Thruxton does have a cush drive. There is an aluminum hub that the sprocket bolts to, but that hub is not bolted to the rim's hub - there's a rubber fitting that separates the two. Give it a try: next time you have your wheel off, just pull on the sprocket, it will slide right out.
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Old 05-14-2010, 11:50 AM   #9 (permalink)
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Quote:
Originally Posted by bred View Post
on the thruxton, the sprocket bolts to the hub, as does the disk/rotor.
The Thrux is just the same as the other variants.

Sprocket bolts to this part of the hub...............



Which connects to the remainder thro the cush drive................






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Old 05-14-2010, 11:59 AM   #10 (permalink)
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well, i considered the cush hub as part of the main hub assembly. its in there pretty well...
regardless, does the disk have to be on? ive read balancing instructions, on real balancing equipment, not the homemade ones, that disks and sprockets should be removed... but it just seems counter intuitive...
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