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ironhead rear hub

Moderators: Curt!, Pa

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Scott

Posts: 117

Joined: Wed Nov 06, 2002 1:01 am

Post Thu May 14, 2015 7:53 pm

ironhead rear hub

Has anyone used a drum brake Sportster rear hub on their 45"? I have an otherwise stock 45" and am wondering how much spacing/machining it would take to make the sprockets line up. I have a cable operated brake plate so a brake linkage won't be a problem. Thanks!
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Samsup

Posts: 135

Joined: Wed Feb 25, 2015 2:35 pm

Post Fri May 15, 2015 6:21 am

Re: ironhead rear hub

Scott wrote:Has anyone used a drum brake Sportster rear hub on their 45"? I have an otherwise stock 45" and am wondering how much spacing/machining it would take to make the sprockets line up. I have a cable operated brake plate so a brake linkage won't be a problem. Thanks!


Dont know.. The most important question will be: is the diameter of the sprocket the same size? If significanty larger you will get very high engine revs and low speed..
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Pa

Site Admin

Posts: 5273

Joined: Sun Mar 12, 2000 1:01 am

Location: Ohio USA

Post Fri May 15, 2015 6:27 am

Re: ironhead rear hub

If you are wanting to use a 16" tire size, you can just change out the rim and spokes on your 45 hub.
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Scott

Posts: 117

Joined: Wed Nov 06, 2002 1:01 am

Post Fri May 15, 2015 8:06 am

Re: ironhead rear hub

No, I have a Sportster real wheel and a pre-1964 conical front. Did have a BSA box and modified Yamaha rear hub. I know the easiest way out would be a proper 45 rear wheel (w/18" rim) but I can't be too spendy. This is why I'm curious to see which would by easier/cheaper - modifying the Sportster rear hub or somehow getting a 45 hub (new aftermarket or runnable original). I haven't checked prices yet.

Don't know stock 45 count but Sportster sprocket has 51 teeth.

Bike is far from original so ruining collector value is not even close to a concern. All advice appreciated!
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45Brit

Posts: 1581

Joined: Tue Nov 27, 2007 2:29 am

Post Fri May 15, 2015 8:43 am

Re: ironhead rear hub

45 rear sprocket is 41T so 51T would be very low overall gearing. The rear brake torque anchor looks very different, too.

If you are reverting to stock gearbox and chain line, I'd suggest that the most cost effective approach would be a Japanese or British back wheel with a the brake in the centre, then look for a dished sprocket or make a spacer to match the chain lines.
Shoot, a man could have a good weekend in Dallas with all that stuff...

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