Most common chainring bcd and bolt pattern?
07-14-21, 09:51 PM
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Most common chainring bcd and bolt pattern?
I want to run a spider on a 1 speed like on BMX bikes when I was a teenager.
If I wanted the most common size to most easily find replacements,
104bcd 4 bolt? Is that right?
Thank you.
If I wanted the most common size to most easily find replacements,
104bcd 4 bolt? Is that right?
Thank you.
07-14-21, 10:30 PM
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What size of chainring are you using? Crank type? Square Taper? Crank length?
For road bikes, 130 - 5 bolt is common for smallest rings > 39 teeth.
110 - 5 bolt is common for smallest rings 34 teeth to 36 teeth.
I think the more modern setups are moving to 110 - 4 bolt.
MTBs have other sizes.
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07-14-21, 11:06 PM
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What size of chainring are you using? Crank type? Square Taper? Crank length?
For road bikes, 130 - 5 bolt is common for smallest rings > 39 teeth.
110 - 5 bolt is common for smallest rings 34 teeth to 36 teeth.
I think the more modern setups are moving to 110 - 4 bolt.
MTBs have other sizes.
MTB and bmx.
07-15-21, 05:36 AM
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Yes, 104mm BCD for symmetrical 4-bolt cranks is very common. Direct mount is becoming popular today as well, which doesn't use a "spider" at all. But I'd say 104mm is the prevailing 4-bolt pattern.
07-15-21, 06:28 AM
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Right now, MTBs are coming out with 96mm asymmetrical 4-bolts, slightly older ones used 96mm symmetrical, and slightly older MTB doubles and triples used 104mm symmetrical, even older ones used 110 5 arm symmetrical. Modern road cranks use 110 4 arm asymmetrical. These sizes are very easy to source 1x rings for.
There are other BCDs out there but these are the newest-ish ones that have a lot of 1x rings. For max 34t, a 110 5 arm crank is very hard to beat for versatility.
There are other BCDs out there but these are the newest-ish ones that have a lot of 1x rings. For max 34t, a 110 5 arm crank is very hard to beat for versatility.
