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Old 03-11-2020, 06:17 PM
luiscoll luiscoll is offline
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Default Three bolt, 3" bolt pattern hub and I can't find a sprocket to fit!

Bear with me, this is my first build and I may not know what I am doing...I recently bought a project cart and it has three-bolt hubs with a 3" bolt pattern. I am finding it impossible to find a #35 sprocket (60 - 72 tooth) or appropriate universal sprocket carrier (for a split sprocket) to fit this pattern. Does anyone have any idea what I could get to fit or were I could find a sprocket for this hub?
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Old 03-11-2020, 06:40 PM
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Blank sprocket and drill holes?
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Old 03-11-2020, 10:03 PM
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Welcome!
well maybe because that is not a 3" bolt hole circle at all.. it's a 88mm bhc
(sometimes refered to as 89mm bhc... for some unknown reason )

diameter of bolthole circle for a three hole pattern is 2/root(3) * bolt hole spacing
so 1.1547 times boltholespacing for a bhs of 76.2mm that's 88mm

3 on 88mm is not an unusual size for ATV rims.
So chinese manufacturers parts lists is what you need to look at I guess

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Old 03-12-2020, 09:05 AM
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Anickode,

Thanks. I have considered drilling the holes. Always an option!

---------- Post added at 09:05 AM ---------- Previous post was at 09:03 AM ----------

Sid,

Thanks! I have ran across some Chinese ATV results in my searches. That makes those returns make sense!

I really appreciate the feedback. I will update if this allows me to find the sprocket I'm looking for.
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Old 03-12-2020, 10:21 AM
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I haven't seen a sprocket for that bolt hole pattern

brake discs yes.. sprockets not..
On ATVS the sprockets don't sit at the wheel at all

Where's that hub coming from, where doe it belong to,
and why don't you just pick a more common hub instead
(one that eases the finding of wheels and sprockets for example like 4 on 4 )

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