Rizal Philippines
December 24, 2015
Workshop from bike radar - converting to single or double chain ring for 9 speed set up
One way of reducing weight of MTB is to go for 2 chain ring 26 and 36, remove the 18 or 17 cogs, for a 10 speed and add 42 t cogs (with the One upgrade that weighs only 55 grams). This is possible if you have XT or XT R cogs.
For an 11 speed set up with XTR, XT gear set. with 26 er
26 36
10 67.6 93.6
12 56.3 78
14 48.3 66.8
16 42.2 58.5
18 37.5 52
21 32.2 44.5
24 28.2 39
28 24.1 33.4
32 21.1 29.
36 18.5 26
42 16.09 22.3
However, I checked with Haooh in Taytay Rizal and told me that 24 granny would be easier to acquire
Let us recompute for a 27.5 with a 10 speed cogs.
As you can see, at 24 x 42, you can really a very low gearing at 15.71!!!
24 36 (for 27.5er)
11 59.99 89.99
13 50.76 76.15
15 44 66
(17) 38.82 58.23 (this will have to be removed to accept the 42
19 34.73 52.10
21 31.42 47.14
24 27.5 41.25
26 25.38 38.07
32 20.62 30.93
36 18.33 27.5
42 15.71 23.57
At 36 you can just use one chain ring and not shift (may be this is their choice for single ring. 93 would be near 100 which is near the 50 x 12 gearing.. 26 would be enough to cover most hills and ascents. Now I understand the craze for single chain ring the 36 choice, and the 42 cog. Splendid
The upgrade will set you back:
One up 42 - P2,300
New chain ring
24 - 1,300
36 2,000
Total 6,600
