#16
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On my current gravel bike I am using a 98mm Phil Wood ISO bottom bracket, which results in chainline around 44-45mm and 143mm Q factor with a minimal offset to the left. Prior to finding the 98mm Phil BB I used Phil and Campagnolo 102mm ISO bottom brackets. Either of these will be easier to find than 98mm. With 42/29 rings, shifting to the big ring is acceptable but not excellent using either a Campagnolo 10 speed or IRD front derailler. When I tried the same cranks with 48/32 a Campagnolo 10 speed derailler would not shift to the big ring out of the stand. Your mileage may vary with some other derailler. |
#17
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I have just stuck with the Phil or other 103mm JIS, but nice to hear some ISO setups have worked as well. Like the style guys! TA rings and Grey Logic Compacts. Perfection. My NOS set on a re-build in progress now: |
#18
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Love to see I’m not the only one rocking them like this! Just got my 107mm BB today which I ordered before I saw all the confirmation of 103mm, I’m assuming this clearance is looking far too much?
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#19
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#20
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and another with Campagnolo 102mm: [/url] FWIW I usually measure chainline from the seat tube and add 14.3mm, aka 9/16" |
#21
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I think that JIS is correct, but if the taper in your cranks is relatively unworn, you can use ISO which will move the chainline inwards.
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#22
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According to Sheldon Brown "if you install a J.I.S. crank on an ISO spindle, it will wind up about 4.5 mm farther in than it would on a J.I.S spindle of the same length." |
#23
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It takes a ton of tension to get it shift up it seems and it always throws it over the outer chainring into the crank arm, if I tighten up the outer limit screw enough that it doesn’t drop it won’t quite be able to shift up into the big ring! I’m on 50-34 rings and a full Chorus 11 2015+ group. |
Tags |
bottom bracket, length, spindle |
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