44T sprocket diameter too small

gobiewankenobi · Sep 10, 2009

The sprocket, in the kit that's yet to arrive, has an inner diameter of 3.7cm. The hub that it needs to go onto is more like 5cm.
How can I go about enlarging this hole? Or is there a replacement sprocket that I can get that will work? The bike is an older cruiser model, 3 speed internal gear hub with coaster brake.

Thanks.

RedB66 · Sep 10, 2009

It depends on your resources. You can dremmel the hole larger, hand file or stick a found file in your drill chuck. Just be sure to keep the hole even.

Venice Motor Bikes · Sep 10, 2009

I once used a cutting torch & a fat round file, because it was going on a really big hub!!
It helps to first draw the new hole size with a felt marker, (to keep the hole even & centered)

Coval_PL · Sep 11, 2009

gobiewankenobi said:
The sprocket, in the kit that's yet to arrive, has an inner diameter of 3.7cm. The hub that it needs to go onto is more like 5cm.
How can I go about enlarging this hole? Or is there a replacement sprocket that I can get that will work? The bike is an older cruiser model, 3 speed internal gear hub with coaster brake.

Thanks.

I've got the same problem. I want to apply new wheels with Sram S7 gear-hub, but it's a lot bigger than standard hub. Making bigger hole or drill new holes for bolts is not so difficult but what about rubber and steel mounting parts? I have no idea how to do those mounting parts.

NEAT TIMES · Sep 11, 2009

if you have the money to spare "manic mechanic" has the best set up around. he advertises on the side column of this forum. check out the pictures. you have to order the one to fit your hub.GOBIE, I`M FROM EAU CLAIRE, WI. BEEN DOWN HERE 20 YRS. WHAT TOWN ARE YOU IN. LATER RON . cvlt1

city of angels · Sep 11, 2009

go to usa bike motors.com web site they sell the hub the sproket kit for around 75. bucks plus tax this set up will prevent you from drilling holes ir putting tension on the spokes the only thing you have to go to a bike shop to get it re spokes plus this also will give you a brake set up

gobiewankenobi · Sep 11, 2009

NEAT TIMES said:
if you have the money to spare "manic mechanic" has the best set up around. he advertises on the side column of this forum. check out the pictures. you have to order the one to fit your hub.GOBIE, I`M FROM EAU CLAIRE, WI. BEEN DOWN HERE 20 YRS. WHAT TOWN ARE YOU IN. LATER RON .

I'm down in Madison. I'm hoping that this will help me do some commuting but, if nothing else, it'll be fun to play with.
While Manic Mechanic's setup looks great, I don't have that much money to play with. I'll probably try to find a machinist in town that will mill out the hole to 50mm. I'd do it myself, but I'm having trouble finding a bit large enough.

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44T sprocket diameter too small

gobiewankenobi

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RedB66

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Venice Motor Bikes

Custom Builder / Dealer/Los Angeles

Coval_PL

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NEAT TIMES

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city of angels

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gobiewankenobi

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