Micro Drive Track?
04-30-06 | 02:10 AM
#1
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Micro Drive Track?
A few months back I grabbed an old 39t 130bcd ring out of a clearance bin to replace the small ring on my road bike. When I got home I realized that the ring was too wide for 8spd chain. I tried 5 speed suntour chain, still too wide. With calipers the ring measures 3mm. The only markings are "<39>" and "FG" and the ring is unused.
I have a few questions:
who ever made a 39t 1/8" 130BCD ring and why?
Is there a meaningful efficiency loss with a smaller drivetrain on a track bike? say 39-12?
Any good reason not to run 39-13 on the street? (aside from lack of skid spots and faster drivetrain wear)
I have a few questions:
who ever made a 39t 1/8" 130BCD ring and why?
Is there a meaningful efficiency loss with a smaller drivetrain on a track bike? say 39-12?
Any good reason not to run 39-13 on the street? (aside from lack of skid spots and faster drivetrain wear)
04-30-06 | 02:14 AM
#2
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Joined: Feb 2006
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From: Long Beach, CA
Bikes: Bianchi Advantage Fixed Conversion; Specialized Stumpjumper FS Hardtail
I asked this same question a while ago. There is less gear contact with the smaller rings, so more wear and not quite as smooth.
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04-30-06 | 04:37 AM
#3
jack of one or two trades
Joined: Jun 2005
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From: Suburbia, CT
Bikes: Old-ass gearie hardtail MTB, fix-converted Centurion LeMans commuter, SS hardtail monster MTB
Might be an old BMX ring? But what kind of BMX cranks are/were 130 BCD... what kind indeed.
