gear won't fit around coaster brake arm
- Thread starter chad223
- Start date
Goat Herder
Gutter Rider
happycheapskate
New Member
A lot of coaster brakes have a dust cap under the brake arm, that rides on the outside of the hub. You can try this method. Remove the brake arm and see if the dust cap has a D shaped hole that mates with the axle cone nut. If so, remove the dust cap (finger removeable or use a pocketknife). See if the cog will slip over the hub where the dustcap was. If not quite, you can file or lathe the hole a little bigger to fit. The dust cap can be flattened or filed down on its lip, to compress against the cog. (grease!)
This has worked for me for over half a year! (using common single-speed or 6 speed chains. 415 doesn't fit. )
This has worked for me for over half a year! (using common single-speed or 6 speed chains. 415 doesn't fit. )
Gator Wrestler
New Member
I have developed a method of enlarging the sprocket hole that is quick and accurate.
I use a power hand drill with a round file chucked into it. The sprocket hole is placed over the round file and using the other hand to hold another file (I use a curved one) the drill is run at a high speed. The sprocket is allowed to spin and the action of both files on opposing sides of the hole quickly enlarge the hole. Don't forget your safety glasses.
Tom
I use a power hand drill with a round file chucked into it. The sprocket hole is placed over the round file and using the other hand to hold another file (I use a curved one) the drill is run at a high speed. The sprocket is allowed to spin and the action of both files on opposing sides of the hole quickly enlarge the hole. Don't forget your safety glasses.
Tom
happycheapskate
New Member
That's great. You can get metal-grinding round bits or round files, round sanding-bits, etc for $10 or less usually. Most people have a drill already or can borrow one. 