possible to get a 113mm Octalink V1-spline BB for fixie use?
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possible to get a 113mm Octalink V1-spline BB for fixie use?
So I've been thinking that Shimano Octalink road cranks (e.g., 5500-series Hollowtech 105) would be great for fixed-gear use. They're stiff, available in 165mm crankarm length, and giving proper 43.5mm road chainline with a 109.5mm bottom bracket, would give proper 42mm chainline on the inner ring if used with a 113mm bottom bracket. However, I've only been able to find Shimano Octalink bottom brackets in 113mm if they have the V2 spline, which is not compatible with 105/Ultegra/DA groups.
This scheme would work with Sora or Tiagra double cranks (which use a 113mm V2-spline Octalink crank) if used with a 118mm V2-spline Octalink crank. But I'm mainly interested in the 105 and up.
This scheme would work with Sora or Tiagra double cranks (which use a 113mm V2-spline Octalink crank) if used with a 118mm V2-spline Octalink crank. But I'm mainly interested in the 105 and up.
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[redacted due to dyslexia]
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Last edited by DMF; 05-24-07 at 11:07 AM.
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Originally Posted by timcupery
So I've been thinking that Shimano Octalink road cranks (e.g., 5500-series Hollowtech 105) would be great for fixed-gear use. They're stiff, available in 165mm crankarm length, and giving proper 43.5mm road chainline with a 109.5mm bottom bracket, would give proper 42mm chainline on the inner ring if used with a 113mm bottom bracket. However, I've only been able to find Shimano Octalink bottom brackets in 113mm if they have the V2 spline, which is not compatible with 105/Ultegra/DA groups.
This scheme would work with Sora or Tiagra double cranks (which use a 113mm V2-spline Octalink crank) if used with a 118mm V2-spline Octalink crank. But I'm mainly interested in the 105 and up.
This scheme would work with Sora or Tiagra double cranks (which use a 113mm V2-spline Octalink crank) if used with a 118mm V2-spline Octalink crank. But I'm mainly interested in the 105 and up.
I've looked, but not too hard, for other Octalink lengths and didn't come across any. Square taper appears to be the single cog way.
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Originally Posted by DMF
You'll just have to look harder. They're out there. Tried eBay?
Btw, check a local store. My local Performance has a 113 Ultegra (V1) on the shelf and they don't even know it.
Btw, check a local store. My local Performance has a 113 Ultegra (V1) on the shelf and they don't even know it.
Originally Posted by vpiuva
The cranks may be OK, but everyone has abandoned the Octalink/ISIS concept because of shortened bearing life, and my guess is that fixie use would even be harder on BB bearings than standard use.
I've looked, but not too hard, for other Octalink lengths and didn't come across any. Square taper appears to be the single cog way.
I've looked, but not too hard, for other Octalink lengths and didn't come across any. Square taper appears to be the single cog way.
I agree that square-taper appears to be the single cog way (and I have it on all my bikes except for an FSA compact double with ISIS interface on my "fast" road bike) but it seems that this use of old Shimano cranks would be a good way to set up a fixie. If available.
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Ooops. I think I'm dyslexic. I typed 113 instead of 118 a couple days ago, and I just read your 113 as 118.
Fact is, I don't know if a 113 V1 was ever made. So "Never mind!" (Sorry.)
Fact is, I don't know if a 113 V1 was ever made. So "Never mind!" (Sorry.)
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Originally Posted by timcupery
So I've been thinking that Shimano Octalink road cranks (e.g., 5500-series Hollowtech 105) would be great for fixed-gear use. They're stiff, available in 165mm crankarm length, and giving proper 43.5mm road chainline with a 109.5mm bottom bracket, would give proper 42mm chainline on the inner ring if used with a 113mm bottom bracket. However, I've only been able to find Shimano Octalink bottom brackets in 113mm if they have the V2 spline, which is not compatible with 105/Ultegra/DA groups.
109.5 mm
112.5 mm
116 mm
118.5 mm
The two middle size were intended for the short-lived XTR version, and may be difficult to find.
Another option would be to use the 109.5 with a spacing washer under the right side mounting ring. The popluar washer for this is the Sturmey-Archer sprocket spacing washer, 1/16" (1.6 mm) thick.
Originally Posted by timcupery
This scheme would work with Sora or Tiagra double cranks (which use a 113mm V2-spline Octalink crank) if used with a 118mm V2-spline Octalink crank. But I'm mainly interested in the 105 and up.
Sheldon "Octalink" Brown
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Thanks Sheldon. Any BB for a short-lived XTR version is probably expensive beyond the value of a cheap conversion to a nice fixed-gear option.
And I'm interested in the V1 spline specifically b/c I've got a 105 crank with 165mm arms sitting around
So it looks as if the 105 crank with a 109.5mm V1-spline bottom bracket would work, if I went with 40mm chainline (which is where the inner ring would be with a 43.5mm road-double chainline, given that every crank I've measured (from old Sugino that came with 10-speed bikes to modern FSA designed for use with 10-speed cassettes, the chainrings are 7mm apart).
And I'm interested in the V1 spline specifically b/c I've got a 105 crank with 165mm arms sitting around
So it looks as if the 105 crank with a 109.5mm V1-spline bottom bracket would work, if I went with 40mm chainline (which is where the inner ring would be with a 43.5mm road-double chainline, given that every crank I've measured (from old Sugino that came with 10-speed bikes to modern FSA designed for use with 10-speed cassettes, the chainrings are 7mm apart).
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Originally Posted by timcupery
Thanks Sheldon. Any BB for a short-lived XTR version is probably expensive beyond the value of a cheap conversion to a nice fixed-gear option.
And I'm interested in the V1 spline specifically b/c I've got a 105 crank with 165mm arms sitting around
So it looks as if the 105 crank with a 109.5mm V1-spline bottom bracket would work, if I went with 40mm chainline (which is where the inner ring would be with a 43.5mm road-double chainline, given that every crank I've measured (from old Sugino that came with 10-speed bikes to modern FSA designed for use with 10-speed cassettes, the chainrings are 7mm apart).
And I'm interested in the V1 spline specifically b/c I've got a 105 crank with 165mm arms sitting around
So it looks as if the 105 crank with a 109.5mm V1-spline bottom bracket would work, if I went with 40mm chainline (which is where the inner ring would be with a 43.5mm road-double chainline, given that every crank I've measured (from old Sugino that came with 10-speed bikes to modern FSA designed for use with 10-speed cassettes, the chainrings are 7mm apart).
Sheldon "Straight And Narrow" Brown
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have you tried it with a 109? since chainline for a double in theory is measure between the two chainrings, good chance it'll be good enough for to be gov't work, particularly with a 3/32" chain.