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
Adding One up 42t
Upgrade to single chain ring 30 t.
According to an MTB rider I interviewed at Antipolo Church today, this is the best uprade you can make. It can easily lighten the MTB by as much as kg because you save on: the bolts, two other chain rings, and the spider arms, the cable, the FD, the thumb shifter and the cables. And no problem with chain jumping missed shift of FD.. So mostly this is the set up for 29er. Let us compute for the gear inches.
Chain wheel 30 Wheel size 29
Cogs
11 79.09
13 66.92
15 58
( 17 ) 51,17
19 45.78
21 41.42
24 36.25
28 31.07
32 29.00
36 25.77
42 22.09
The lowest here is only 22 vs the granny gear of 24 at double chain set up of 15.71. For a 32 cogs set before, that is ultra low....
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