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PostPosted: Mon Sep 25, 2017 3:04 pm 
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Joined: Sat Jan 04, 2014 6:26 pm
Posts: 123
I have the opposite on my bike. I tend to spin the legs and I am usually fairly good climber - also the climbs around my area arent as steep. For this reason I opted for 52/39 and this can be felt during shifting from big chainring to smaller chainring. Sometimes when I am in the lower part of cassette the chain seems to be stack between the chainrings and dont want to engage on the small chainring.

It is funny because I specifically asked about this the Campagnolo Distributor/Sales point and they made them custom made for me. And hasn't mentioned anything about a non-compatible combination...

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Trek Madone 7s 60 H1
Trek Emonda SLR H1 Campy Record


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PostPosted: Tue Sep 26, 2017 10:11 am 
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Joined: Tue Mar 22, 2016 1:52 pm
Posts: 49
graeme_f_k wrote:
50/34 doesn't work anything like as well - tooth timings are out relative to the ramping / pinning so you are essentially back to the kind of front shift you had pre-ramps, with just pins. We have run it with stock rings on the pro teams as an experiment - got a thumbs-down from the pros. The second problem is the overall depth of the cage. If you are running 12-29 you'll find that fully cross-chained, dpending on seat angle and BB drop, you may and may not be able to avoid the chain hitting the inside top of the cage in big to big whilst clearing the rear bridge on small to small, or vice versa.

So if combination 52/34 (50/34 is of course mistake) is a problematic situation, what can You write about other combination 52/39? The shifting performance will also compromise?
Or I just have to stick with the fabric combinations 50/34, 52/36, 53/39...


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Posted: Tue Sep 26, 2017 10:11 am 


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