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  #1 (permalink)  
Old 01-21-2018, 06:32 PM
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Rear wheel question

I have an 18x81/2 80 spoke rear wheel and Iím trying to find out what the offset measurement from the sprocket mounting surface to the wheel lip should be. Iím trying to align my sprockets and something just doesnít seem right with the rear wheel. I might be totally wrong but Iíd like to know what the measurement is so I can check mine. Any help is appreciated.
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Old 01-22-2018, 04:06 AM
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I always run a straight-edge from the (mounted) transmission sprocket to the rear sprocket on the wheel. Once I make sure it is perfectly straight, I have rear wheel spacers made to the exact measurements I get on each side. This guarantees the wheel to track right, and the chain or belt will wear right as well. You will also have to shim the rear brake caliper once finished. I'm sure there are others on here that do this a little differently, but running the wheel and chain/belt straight is safer and easier on parts
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Old 01-22-2018, 04:38 AM
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I would do this:
Set rear sprocket using multiple washers to clear the chain from the tire.

Center the wheel and then look for a correct offset transmission sprocket[ USING THE STRAIGHT EDGE LIKE IN THE PRIOR POST]
Once you have this rough preliminary alignment, you can fine tune, do minor perfection adjustments of the rear sprocket, moving it a bit closer or farther from the wheel[ try not to move the wheel from the center!] and finally cut or order the necessary rear sprocket spacer.[ the catalogs have very thin, shim like to achieve the perfection, but i'd rather have one solid, custom made]
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Old 01-23-2018, 09:16 AM
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There is no standard offset you kind of have to mock it up and align the chain first. Once you do that you can decide if further offset or spacing is required to center the wheel in your frame or swingarm...
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Old 02-02-2018, 12:59 AM
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You can use pvc pipe to make spacers for mockup.
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Old 02-03-2018, 04:57 PM
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Rear wheel question-19c2faca-401b-4c9c-b6fe-a6b51e794158.jpg this is the measurement Iím asking about. Measuring on sprocket side
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Old 02-04-2018, 04:26 AM
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I see what you mean. Wouldn't this be determined by the primary gear/Pulley ? My BBC chain was like 1/2" from the tire.
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Old 02-04-2018, 04:36 AM
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For me, all measurements start from the centered transmission in frame. From there, you'll center your rear wheel in frame on axle. Once this is dead center, then you calculate if you need a spacer in back, or a shim in front. I use a straight edge from enter of front sprocket to rear wheel, or rear wheel, which ever sticks out further. This is the sprocket/pulley that needs spacing.
From the picture, it appears to me that the manufacturer has already pushed the hub out past the lip of the rim and tire, so your spacer or shim will probably be on transmission.

When I built my last bike, I ran a 300mm tire. In this case, I made a shim up front so the chain ran perfectly straight. The hub stuck out far enough that it already compensated for the wide tire.
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