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Campy Triple Chainring Question(2 posts)

Campy Triple Chainring Questionscottr
Jul 25, 2003 9:30 AM
I was wondering if anybody had any experience with putting a 40T for a middle ring instead of the 42T. I have a customer that wants the 53 but does not want the 42 for the middle. So we would change it to a 53-40-30.

Thanks for any input.
why?DougSloan
Jul 25, 2003 9:44 AM
I tried putting an unpinned 39 instead in my Record triple, but the shifting wasn't good. A pinned middle might be better.

Howver, a 53-40-30 has tons of nearly identical ratio duplications; check it out:

53 40 30
12 117.5 88.7 66.5
13 108.4 81.8 61.4
14 100.7 76.0 57.0
15 94.0 70.9 53.2
16 88.1 66.5 49.9
17 82.9 62.6 46.9
19 74.2 56.0 42.0
21 67.1 50.7 38.0
23 61.3 46.3 34.7
25 56.4 42.6 31.9

You can run combos here:

http://www.midcalracing.com/gears.xls