bigdreamz2000 (User)
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| sprocket hole too small for rear hub 2008/11/21 03:33 |
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I'm on my 3rd build now and I've come across a problem with the rear sprocket hole not fitting over the rear hub. Has anyone tried to enlarge the hole with any success? Thanks.
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stuartracing (User)
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| Re:sprocket hole too small for rear hub 2008/11/21 09:02 |
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All depends on how much bigger ya gotta go....I`ve used my die grinder with some good results....Just go a little at a time so you don`t get it out of round....
Good luck,
Paul...
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cameracamel (User)
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| Re:sprocket hole too small for rear hub 2008/11/21 21:26 |
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I put the 48cc kit on a walmart cruiser coaster brake bike. A local machine shop enlarged the sprocket hole for $30.
Don here. I live in Mesa, AZ. Been in Arizona for 5 years now, before that, 28 years in St. Petersburg, FL as official photographer for the City of St. Pete.
Many motorcycles but this is my first bike since I was 15. This bike is my new photography platform. I bought a trailer for it.
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Bikeguy Joe (Moderator)
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| Re:sprocket hole too small for rear hub 2008/11/22 17:59 |
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Why don't you just grind the edge flange off the dust cap?
It takes 2 minutes and costs nothing.
I have done it on all my builds and I believe the fine folks at SpookyTooth Cycles do this as well.
Self employed genius visionary, biker, thrill seeker....
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bigdreamz2000 (User)
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| Re:sprocket hole too small for rear hub 2008/11/25 04:23 |
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I had success with putting the sprocket into a vice and using a large tapered diegrider bit to grind out a couple millimeters using a circular motion going in the direction of the bit. I found when I went against the direction of the bit it would hang up and put a gouge in it. It stayed very true using this technique. I was worried about it ovaling, but since I only had to get a little out it did not warp. I would not pay $30 to have someone do that. It was very easy. Now I'm having clearance issues with carb fitting and a pedal hitting the engine. This is an old Raliegh from the 80's or 70's. I think I am going to try and use a lot of rubber in the engine mounts so that it mounts higher to give me carb and pedal clearance. For such a classic open frame bike with small tubes, this is giving me the most problems thus far.
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vulcan (User)
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| Re:sprocket hole too small for rear hub 2008/11/25 09:55 |
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Just how big is the hole in the sprocket? I have a mid '80s Trek cromoly mountain bike frame, and wheels with Araya rims, stainless steel spokes, and Shimano wide flange hubs,that I was going to use to build a motorized bike out of. The frame measurements are ok, but I have a feeling the sprocket will not fit on the rear wheel. I wanted to use these wheels because they are super strong and light. They are as good or better than the wheels that come on new $1000+ mountain bikes, so I sure don't want to damage them. Jerry.
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Bikeguy Joe (Moderator)
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| Re:sprocket hole too small for rear hub 2008/11/26 02:48 |
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The problem usually is because of a coaster brake hub. Grind off the outer flange of the dust cap and put the sprocket on...it can't be simpler.
You will want to use a very hard type of rubber if you are going to use it as a spacer for the mounts....if the engine can move more than a mm it's going to throw the chain and have other problems.
Self employed genius visionary, biker, thrill seeker....
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