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| Our Forums | | | | Motorized Bicycle General Discussion Topics on bicycle engine kits, help articles, repair and modifications for your motorized bicycles | Sprocket Installation Problem Discussion at Motorized Bicycle Engine Kit Forum in the Motorized Bicycle General Discussion forum. I've run into a problem installing the sprocket on the rear hub. The center hole of the sprocket is 1 ...  | | 
04-20-2009, 02:43 PM
|  | Motorized Bicycle Newbie | | Join Date: Mar 2009 Location: wisconsin
Posts: 18
| | Sprocket Installation Problem I've run into a problem installing the sprocket on the rear hub. The center hole of the sprocket is 1 3/8" diameter, but the hub that it has to fit over is 2" diameter. How am I going to enlarge that center hole in the sprocket so it will fit on the hub? Anyone run into this problem? Do I have to get a different sprocket? I got my kit from DAX.
Thanks, Tom | 
04-20-2009, 02:45 PM
| | Motorized Bicycle Elite Member | | Join Date: Mar 2009 Location: ridgway colorado
Posts: 305
| | Re: Sprocket Installation Problem you will have to enlarge the hole. i did it with a die grinder, be very carefull and try to keep it as round as possible, frank | 
04-20-2009, 02:49 PM
|  | Motorized Bicycle Newbie | | Join Date: Mar 2009 Location: wisconsin
Posts: 18
| | Re: Sprocket Installation Problem That's an awful lot to enlarge with a die grinder, isn't it?
Tom | 
04-20-2009, 03:42 PM
| | Motorized Bicycle Elite Member | | Join Date: Mar 2009 Location: ridgway colorado
Posts: 305
| | Re: Sprocket Installation Problem yes it is ,you could take it to a machine shop if ya got the bucks or get a different wheel. all the sprockets i have seen are about the same size. maybe someone else can help more. look at all the sites here or maybe email dax he knows alot. frank | 
04-20-2009, 04:14 PM
|  | Motorized Bicycle Elite Member | | Join Date: Mar 2009 Location: Top of NY
Posts: 1,788
| | Re: Sprocket Installation Problem did you take the dustcap off your wheel hub?then check the size.
mark a 2" circle on the sprocket,centered
i would use a drill with metal bit and drill holes in a circle until the middle piece comes out.
then use a dremal to get the middle piece out.
Last edited by Cabinfever1977 : 04-20-2009 at 04:36 PM.
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04-20-2009, 04:18 PM
|  | Motorized Bicycle Newbie | | Join Date: Mar 2009 Location: wisconsin
Posts: 18
| | Re: Sprocket Installation Problem Yes, I did. The hub itself is 2". I might try that.
Tom
Last edited by manyguns : 04-20-2009 at 04:40 PM.
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04-20-2009, 06:41 PM
|  | Motorized Bicycle Elite Member | | Join Date: Oct 2008 Location: Urbandale Ia
Posts: 606
| | Re: Sprocket Installation Problem If you are not an a big hurry you can send it to me. I will bore it any size you want for free. All it would cost you is the shipping. Or I can bore one that I have and ship it to you for just the price of the sprocket and shipping.
John | 
04-20-2009, 07:26 PM
|  | Motorized Bicycle Newbie | | Join Date: Mar 2009 Location: wisconsin
Posts: 18
| | Re: Sprocket Installation Problem That's very nice of you. Let me check it out again tomorrow and I'll get back to you.
Thanks, Tom | 
04-20-2009, 08:18 PM
|  | Motorized Bicycle Elite Member | | Join Date: Nov 2008 Location: Ontonagon County,Upper Michigan
Posts: 487
| | Re: Sprocket Installation Problem I wish I came across this earlier......I would have sent you mine to do!
The way I did this was I first found something close to the size of the hub. Then after drawing it on the sprocket, I used one of those powered jigsaws and cut notches to my line, all the way around my drawn circle. Then I pried out a couple of pieces and went ahead and cut the circle out with the jigsaw. It was then that I used the die grinder and it came out really well.
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04-20-2009, 08:44 PM
|  | Motorized Bicycle Elite Member | | Join Date: Mar 2009 Location: Top of NY
Posts: 1,788
| | Re: Sprocket Installation Problem a tomato paste can is 2" round. | | Thread Tools | | | | Display Modes | Linear Mode |
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