9 speed MTB gearing questions
Moderators: Bearbonesnorm, Taylor, Chew
-
- Posts: 2380
- Joined: Thu Dec 15, 2016 7:52 pm
- Location: Peoples Republic of Devon
9 speed MTB gearing questions
I saw an interesting bike for sale that I may well take a pint on. Before I do that I need to get some things straight.
It’s a Shimano 2x9 set up. I’ve been using Rohloff for so long I have no clue about the potential options with 2x9.
It’s I think 22/36 at the front 11-34 at the back.
1) What’s the largest 9 speed casssette generally available - looks like 34t - am I missing something. For example I saw a Box Prime cassette that goes to 50t but looks like it needs specific derailleurs etc.
2) Will a 10or11 speed cassette go on the freeing body?
3) Is SRAM 9 speed compatible with Shimano 9 speed?
4) Is the lowest gear here 22x34 low for a large diameter tyre eg. 26 fat or 29+
I don’t really want to get into spending tons of cash but this bike would definitely need the crawliest crawling gear I can muster.
I’d be willing to swap out the STI shifter for friction thumbies if that’ll expand my horizons.
Thanks
It’s a Shimano 2x9 set up. I’ve been using Rohloff for so long I have no clue about the potential options with 2x9.
It’s I think 22/36 at the front 11-34 at the back.
1) What’s the largest 9 speed casssette generally available - looks like 34t - am I missing something. For example I saw a Box Prime cassette that goes to 50t but looks like it needs specific derailleurs etc.
2) Will a 10or11 speed cassette go on the freeing body?
3) Is SRAM 9 speed compatible with Shimano 9 speed?
4) Is the lowest gear here 22x34 low for a large diameter tyre eg. 26 fat or 29+
I don’t really want to get into spending tons of cash but this bike would definitely need the crawliest crawling gear I can muster.
I’d be willing to swap out the STI shifter for friction thumbies if that’ll expand my horizons.
Thanks
If you are going through hell, keep going.
WSC
WSC
- johnnystorm
- Posts: 3954
- Joined: Wed Nov 21, 2012 9:55 pm
- Location: Eastern (Anglia) Front
Re: 9 speed MTB gearing questions
I've fitted 9 speed 11-36 on my Fargo, originally deore, might be alivio now. Decent quality chromed sprockets all the same. For similar money you can get 11-42 from Microshift.
https://www.decathlon.co.uk/p/cassette- ... R-p-202614
Can't vouch it'll work with a 2x though. The 11-36 is ok on a three by.
https://www.decathlon.co.uk/p/cassette- ... R-p-202614
Can't vouch it'll work with a 2x though. The 11-36 is ok on a three by.
Re: 9 speed MTB gearing questions
i have changed both my bikes back to 9 speed. from 1 x 12
largest sprocket is a 36 tooth. 22 front 36 back feels better to me than 30 x 51 on a 12 speed set up.
12 speed stuff feels like it is gonna break all the time.
a 8/9/10 speed cassette should fit on a hg freehub body. i asked surly about this before converting back to 9 speed.
if i can femember, sram 9 speed is 2.1 actuation, so should work with shimano 9 speed shifter.......i think.
largest sprocket is a 36 tooth. 22 front 36 back feels better to me than 30 x 51 on a 12 speed set up.
12 speed stuff feels like it is gonna break all the time.
a 8/9/10 speed cassette should fit on a hg freehub body. i asked surly about this before converting back to 9 speed.
if i can femember, sram 9 speed is 2.1 actuation, so should work with shimano 9 speed shifter.......i think.
Re: 9 speed MTB gearing questions
The cassette spacing is the same but I'm pretty sure the mechs and shifters aren't cross-compatible between brands. Could be wrong though.3) Is SRAM 9 speed compatible with Shimano 9 speed?
http://blog.artscyclery.com/science-beh ... atibility/ - useful info here, top marks to Art's Cyclery.
Re: 9 speed MTB gearing questions
I have an 11-40 Sunrace cassette (1x9) on my spare/loaner fat bike. I dunno if it'd run okay with a 2x, 9speed rear mech but I am curious to try it on my bikepacking hardtail 29er (which is 2x9). FWIW the aforementioned bikepacking bike is currently running a 22/36 chainset and 11-34 cassette and I find it fine for it's intended task.
-
- Posts: 2380
- Joined: Thu Dec 15, 2016 7:52 pm
- Location: Peoples Republic of Devon
Re: 9 speed MTB gearing questions
Good read. Thanks.jameso wrote: ↑Sun Nov 29, 2020 8:31 pmThe cassette spacing is the same but I'm pretty sure the mechs and shifters aren't cross-compatible between brands. Could be wrong though.3) Is SRAM 9 speed compatible with Shimano 9 speed?
http://blog.artscyclery.com/science-beh ... atibility/ - useful info here, top marks to Art's Cyclery.
What about the splines on the casettes? I think I remember 20years ago a SRAM cassette would go on a Shimano free hub body. Is that (still) the case?
If you are going through hell, keep going.
WSC
WSC
Re: 9 speed MTB gearing questions
Yes, fitting and spacing was the same until SRAM XD 1x11 and Shimano 12s microspline.
The good ol' days..
The good ol' days..
-
- Posts: 2380
- Joined: Thu Dec 15, 2016 7:52 pm
- Location: Peoples Republic of Devon
Re: 9 speed MTB gearing questions
Yep.
It does make me very glad to run Rohloff
If you are going through hell, keep going.
WSC
WSC
- fatbikephil
- Posts: 6541
- Joined: Wed Apr 02, 2014 10:51 pm
- Location: Fife
- Contact:
Re: 9 speed MTB gearing questions
Another 9spd sun race sprok user here - 11-40. Works fine with an old type non shadow 9speed rear mech. If you use such a wide range cassette with a 2x up front you may run into capacity problems with the mech but may be a case of not using certain combos.
- ledburner
- Posts: 2035
- Joined: Mon Oct 12, 2020 8:47 am
- Location: The worsted place in West Yorkshire,
Re: 9 speed MTB gearing questions
I'm sticking with my rohloff. I've moved over to oval chain rings, now, double Chainring at front to select on road /off road gear ranges. Ideally it would have a 16T+15T double sprocket at the rear instead, to do faster shifting... Also lighter & less complicated.
I hope you think you know, what I might of exactly meant.
Warning - may contain value odded typos & ither mythspellings..
Warning - may contain value odded typos & ither mythspellings..
- Escape Goat
- Posts: 2603
- Joined: Thu Nov 01, 2018 10:41 pm
- Location: Not nearly close enough to Scotland...
Re: 9 speed MTB gearing questions
Have a look at box components. Just got the box 2 for the Hunt. Maybe if I like it I'll switch that to the fatty and get swish box 1 for the mtb.
Do you use sliding drop outs or a chain tensioner? Id love a Rohloff, but I use ovals.
ledburner wrote: ↑Mon Nov 30, 2020 12:51 amI'm sticking with my rohloff. I've moved over to oval chain rings, now, double Chainring at front to select on road /off road gear ranges. Ideally it would have a 16T+15T double sprocket at the rear instead, to do faster shifting... Also lighter & less complicated.
Do you use sliding drop outs or a chain tensioner? Id love a Rohloff, but I use ovals.
My Movie Channel: https://tinyurl.com/YoutubeEG
My Instagram: https://www.instagram.com/allen.boardman
My Instagram: https://www.instagram.com/allen.boardman
- ledburner
- Posts: 2035
- Joined: Mon Oct 12, 2020 8:47 am
- Location: The worsted place in West Yorkshire,
Re: 9 speed MTB gearing questions
Original Chain tensioner circa 1999 on a cube 29er frame. Hub #001351 so waiting for it to bed in! (chain) Tensioner has new spring kit.
Last edited by ledburner on Fri Dec 04, 2020 1:11 am, edited 1 time in total.
I hope you think you know, what I might of exactly meant.
Warning - may contain value odded typos & ither mythspellings..
Warning - may contain value odded typos & ither mythspellings..
-
- Posts: 351
- Joined: Tue Aug 08, 2017 7:15 pm
Re: 9 speed MTB gearing questions
I ran 11-36 and 11-40 sunrace on a 1x9 commuter for year or so using a long cage XT mech. Worked but the 40 didn’t shift as well as I’d hoped.
Good simple budget options though
Good simple budget options though
-
- Posts: 2380
- Joined: Thu Dec 15, 2016 7:52 pm
- Location: Peoples Republic of Devon
Re: 9 speed MTB gearing questions
Nice old Rohloff. My oldest is #002775.
If you are going through hell, keep going.
WSC
WSC
- ledburner
- Posts: 2035
- Joined: Mon Oct 12, 2020 8:47 am
- Location: The worsted place in West Yorkshire,
Re: 9 speed MTB gearing questions
It was the original cc type quick release converted to disk 3yrs ago and free overhaul in the 'mother land' - internal springs& seals update. Not bad after 15+ years. Original shifter, new rubber from a gripshifter is more comfortable. I just need heart, legs & lung upgrading., it was relaced on a 29er rom.
ALL'S good. It was, also stolen an neglected. & recovered 10 years later.. . A excellent of top class cycle engineering..
ALL'S good. It was, also stolen an neglected. & recovered 10 years later.. . A excellent of top class cycle engineering..
Last edited by ledburner on Fri Dec 04, 2020 1:14 am, edited 1 time in total.
I hope you think you know, what I might of exactly meant.
Warning - may contain value odded typos & ither mythspellings..
Warning - may contain value odded typos & ither mythspellings..
-
- Posts: 2380
- Joined: Thu Dec 15, 2016 7:52 pm
- Location: Peoples Republic of Devon
Re: 9 speed MTB gearing questions
Snap
All except mine had the CC -DB conversion in 2007 and is mounted in it’s 3rd rim and 4th frame.
Wonder how much of this 2x9 will last that long?
All except mine had the CC -DB conversion in 2007 and is mounted in it’s 3rd rim and 4th frame.
Wonder how much of this 2x9 will last that long?
If you are going through hell, keep going.
WSC
WSC
Re: 9 speed MTB gearing questions
SRAM and Shimano 9 spd aren't compatible. 9, 10, 11 spd cassettes will fit. If using friction shifters, take your pick, up to 11*50T.
EDIT - but probably need new mech for 36+
EDIT - but probably need new mech for 36+