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Recreational Cyclocross and Gravelbiking This has to be the most physically intense sport ever invented. It's high speed bicycle racing on a short off road course or riding the off pavement rides on gravel like :The Dirty Kanza". We also have a dedicated Racing forum for the Cyclocross Hard Core Racers.

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Old 08-15-12, 05:20 PM   #1
skeem
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thorne/ blackspire chainring question 38x42?

To start off Im very good bike mechanic, but I have not dabbled with weird CX ring choices before, so Im experimenting on my own bike.
I decided to get fancy and order some Blackspire 38x41 130bcd chainrings, the 41 being the outer. I thought it'd be cool to experiment with ring sizes, but I was wrong (and should have stuck with a standard size range). My sexy rings came today and after much fussing, and tweaking, I was wholly unable to get the chain to shift. the 38x41 range is too close and the chain cant hit the ramps to shift up- it only get caught between the 2 rings. why they make the 41 as an outer is beyond me and the unhelpful man at Blackspire could only tell me that the europeans love the 41 ring, bt he did not know what would work with a 38. I was wondering if anyone knows if a 42 will work in the stead of the 41. by work I mean actually shift properly- Im running Campy record so I want my first geared cross bike to work well. A man at cxworld said the 42x38 thorne combo they have will work, according to his mechanic. Does anyone know if a 42 blackspire will work the same, or, what it the smallest outer ring one can run with a 38 inner? Anyone use the thorne stuff- Blackspire will refund me and Id buy thorne. 44 is the biggest I could go though. I have ridden ss for a few years and just like a low gear combo. Thanks in advance for all of your knowledge.
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Old 08-16-12, 05:42 AM   #2
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Stu's rings are nice I'd run 44X38 if I were you why run such a tight front drive train? you'll like the ratios better I think with 44X38 & 12-27 out back.
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Old 08-16-12, 07:37 AM   #3
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does a 44 shift well with the 38? thats all im really concerned about. I spent a lot on the Blackspire rings which dont work. I want to run as tight a ratio as possible because I have 12-25 in the back, and (because I ran a 42x20 for 2 years and now have a 39 up font with gears) Im used to lower gearing.
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Old 08-16-12, 08:16 AM   #4
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Originally Posted by skeem View Post
does a 44 shift well with the 38? thats all im really concerned about. I spent a lot on the Blackspire rings which dont work. I want to run as tight a ratio as possible because I have 12-25 in the back, and (because I ran a 42x20 for 2 years and now have a 39 up font with gears) Im used to lower gearing.

One of the racers bike I looked after last season ran the 44X38 w/o issues, the 44 to my recollection had no ramps though it was an FSA model; it got a little noisy the higher up in the back you shifted due to the lack of beveling & shaping in in the teeth they way true outboard rings are treated like SRAM/Truvativ 46T 130 BCD rings. I run 46X38 - 12-27 personally and I like it ... the 42 T is more for the Single front ring crowd.
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Old 08-16-12, 08:17 AM   #5
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Originally Posted by skeem View Post
does a 44 shift well with the 38? thats all im really concerned about. I spent a lot on the Blackspire rings which dont work. I want to run as tight a ratio as possible because I have 12-25 in the back, and (because I ran a 42x20 for 2 years and now have a 39 up font with gears) Im used to lower gearing.

One of the racers bikes I looked after last season ran the 44X38 w/o issues, the 44 to my recollection had no ramps though it was an FSA model; it got a little noisy the higher up in the back you shifted due to the lack of beveling & shaping in in the teeth they way true outboard rings are treated like SRAM/Truvativ 46T 130 BCD rings. I run 46X38 - 12-27 personally and I like it ... the 42 T is more for the Single front ring crowd.
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