Rear Sprocket Offset?

PaperBoy2000

New Member
Jul 25, 2018
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Hello, new to this forum, I will be working with a 80cc Chinese ebay kit, and a clearance Columbia 1937 model. I have gathered all items I think I need, and am now searching this website to try to see which way to install the rear sprocket. It may be self explainetory, but I do not have the items at my house in front of me, I'm working on it at another garage without internet (I only use a computer at home, and have a flip phone) and wanted to be prepared to not have to redo this item twice or more. I'm thinking I would want the offset towards the left, outside, to clear tire, but it looks like most internet pictures I see show the teeth offset inside towards spokes.
I am trying to keep everything OEM at first in order to get accustomed to how the thing runs before I try modifying things.
 

crassius

Well-Known Member
Sep 30, 2012
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rule of thumb is 'skinny tire dished in - fat tire dished out' - on some bikes this will move the problem from rubbing the tire to rubbing the frame

tensioner placement can sometimes get chain off frame

if that is a coaster brake bike, then hole in sprocket won't fit over hub cap (DO NOT just throw it away) file hole out bigger
 
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Bikeguy Joe

Godfather of Motorized Bicycles
Jan 8, 2008
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Unfortunately...you'll have to fit it up, and see which way it has to go. (I'll bet it goes dished in)
I always have the sprocket dished in so the teeth are closer to the spokes.
I have never built one with the teeth out, and I have built fat tires and skinny tire bikes.
The important part is chain alignment.
 

Bikeguy Joe

Godfather of Motorized Bicycles
Jan 8, 2008
11,843
235
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up north now
The worst problem I've ever had was one bike with whitewalls got a blackwall on the chain side from the greasy chain touching the tire lightly.