December 23, 2015
It will be Christmas in one days time. Merry Christmas
I looked again at the gear ratios of the MTB vs the compact (50 x 34) chain sets and found the versatility of modern MTB cogs and chain sets. As I mentioned earlier, for the 44 largest chain set x 11 to 32 cogs, the biggest gear inches and the smallest would cover the gear inches for a 50 x 34 chain set
Roadie 50 x 34 chain set
50 34
11 112 76
12 103 70
13 96 65
14 90 61
15 84 57
17 79 54
19 71 48
21 64 43
23 58 39
25 54 36.7
For an MTB with first two chain rings at 44 and 32 teeth
44 32
11 109 78.8
12 99 76
14 79 61
16 74 54
18 66 48
22 54 39
25 47 34
28 42 30
32 37 27
Note that the highest gear inches of 50 is 110 and lowest at 34 x 27 is 36.7 and the 44 chain set 11 to 32 cogs has 109 for 11, and 37 for 32 cog. All you need is the 44 chain ring for all the gear ratio of double chain ring of 50 x 34 bike.
In order to save weight, and for dedicated use of MTB, there is a growing debate as to how many chain rings do you use, 3, 2 or 1. For the 2, they will stick with 44 and 32; for the single chain ring, they would elect o use the 36 x 11 to 42. The preferred supplier for this is SRAM. for the 36 x 11 - 42 combi, the highest would be 88.4 and for the lowest (42) would be 23 ! (That is super low) and close to 22 x 25 gear inches of 21 (the third chain ring of a triplet) No wonder many MTBs are shifting to the single chain rings.
From Performance bike 3, 2 or 1 chain rings?
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