Bike Forums - What is your chainring gearing setup?

Bike Forums (https://www.bikeforums.net/forum.php)

- Touring (https://www.bikeforums.net/touring/)

- - What is your chainring gearing setup? (https://www.bikeforums.net/touring/1062928-what-your-chainring-gearing-setup.html)

Quote:

Originally Posted by rm -rf (Post 18758076)

This sounds like good advice to me. I like the idea of lowering the 3 chainrings down to a usable size, instead of using a wide range cassette. I'm always shifting to find a good cadence. But some riders don't care so much about cadence.

Here's a 22-32-42 with a 9 speed 12-25. Each of the three chainrings has reasonably close shifts.
http://bikeforums.net/attachment.php...hmentid=520914

And the same 22-32-42 with a 11-32. Wider gaps between shifts, especially above 15 mph, where close shifts are helpful.
http://bikeforums.net/attachment.php...hmentid=520915

Here's the Mike Sherman Gear Calculator settings for the 22-32-42 and 12-25. The popup message is telling you that you can bookmark these settings to recall later. Changing cadence or gear sizes will update all the charts on the fly.

Lowest gears
3.0 mph on the low gear 22-25 is 44 rpm. And with a 22-32, it's 55 rpm . For long, steep climbs with a heavy load, that 18 gear inches on the 22-32 might be necessary. The 22-25 is 23 gear inches.

~~~~~~~~~~~~~~~~
To compare: The 22-36-48 and 12-36 mentioned by acantor above. An interesting setup, too. Very low gears, 3.0 mph is 62 rpm.

http://bikeforums.net/attachment.php...hmentid=520923

Hi rm-rf,

I hadn't seen "Mike Sherman" calculator. This one's pretty cool so I ran a partial chart for my setup, can't run a full chart since it's limited to a triple and with the Schlumpf I have a quad with lots of overlap in the middle. Still fun to look at though.

Gadgets

https://dl.dropboxusercontent.com/u/...orums/0001.jpg

Shimano Deore: 26/36/48
Shimano Alivio: 9-speed 11-34t

Works pretty fine to me. I MAY prefer a 24 in the low but I have no motivation to change it.

We run 53-39-26 X 12-34 on our tandem. We spend most of our time in the big ring, which works because we have the wide range cassette we need for climbing. We're only ~1/2 mph slower on the flat loaded than in sport trim as our load is relatively light and fairly aero. This gearing is also pretty easy on our chainrings and cassette: lots of teeth.

Carbonfiberboy, I like to run on the big chain ring and somewhere in the middle of the cassette, and it is easier on the cogs' and chain rings' wear. The one exception I've seen is a good friend of mine is a habitual big-big cross chainer on her mountain bike commuter and her largest cog and chain ring became knife edged ninja weapons. My older daughter is just as bad, but she mainly cross chains a RSX compact double with a 7S. There is just no breaking them of the habit. ;)

Brad

I am using the 42-32-22 chain ring with 12-36 9 spd cassette. The 42T chain ring will be replaced with 44T soon.

Things I dislike. 11T cogs, 32T middle rings for anything but touring. Shimano Mega-gearing jumps.

My commuter 2 bag touring rig. 48-36-24, 14-28 freewheel.
My gravelgrinder and four bag touring rig. 44,32,22 12-34 8sp. I would like a 46,34(6),22 but it is not a stock config
My big boy bike 53-39, 13-25.

44-34-21 x 11-34 9sp, though I think If I were to do it again I'd do 42-32-22 x 12-36 9sp

Quote:

Originally Posted by bradtx (Post 18759125)

Yeah, I never run the bottom 2 cogs with the big ring. Also never run the small cog with the middle ring and never run below the bottom 4 cogs in the granny. More teeth is good, plus the big ring puts less tension on the chain so it lasts longer, too.