Help my fixie get a 42mm chainline!
10-23-08, 08:19 PM
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Help my fixie get a 42mm chainline!
Or whatever ideal is with 120mm rear hub spacing
Right now, I use a 68x103mm and when the chainring is on the inside, the cl is 38/39mm. When I stick the ring on the outside of the crankset, it is about 45mm.
Do I need to go to a 107mm or 110mm to get the chainline to the 42mm I'm looking for (chainring on inside I assume is the only way)?
Right now, I use a 68x103mm and when the chainring is on the inside, the cl is 38/39mm. When I stick the ring on the outside of the crankset, it is about 45mm.
Do I need to go to a 107mm or 110mm to get the chainline to the 42mm I'm looking for (chainring on inside I assume is the only way)?
10-23-08, 08:31 PM
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Assuming your crank is JIS and ignoring chainring/spider frame clearance issues then if you can obtain a ISO bb, say Phil (or any ISO bb) 68x104.5 will set your crank up with the ring on the outside with 42mm chainline.
If you want a cheaper option then, run the ring on the inside and get a 68x107 bb for a 42/43mm chainline.
If you want a cheaper option then, run the ring on the inside and get a 68x107 bb for a 42/43mm chainline.
10-23-08, 08:36 PM
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Assuming your crank is JIS and ignoring chainring/spider frame clearance issues then if you can obtain a ISO bb, say Phil (or any ISO bb) 68x104.5 will set your crank up with the ring on the outside with 42mm chainline.
If you want a cheaper option then, run the ring on the inside and get a 68x107 bb for a 42/43mm chainline.
If you want a cheaper option then, run the ring on the inside and get a 68x107 bb for a 42/43mm chainline.
10-23-08, 09:52 PM
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Or whatever ideal is with 120mm rear hub spacing
Right now, I use a 68x103mm and when the chainring is on the inside, the cl is 38/39mm. When I stick the ring on the outside of the crankset, it is about 45mm.
Do I need to go to a 107mm or 110mm to get the chainline to the 42mm I'm looking for (chainring on inside I assume is the only way)?
Right now, I use a 68x103mm and when the chainring is on the inside, the cl is 38/39mm. When I stick the ring on the outside of the crankset, it is about 45mm.
Do I need to go to a 107mm or 110mm to get the chainline to the 42mm I'm looking for (chainring on inside I assume is the only way)?
Also, yes a JIS crank will slide farther inboard on the same length ISO spindle.
