Author Topic: Large capacity rear 9 gear mechs (Read 1293 times)

cycleman · « **on:** 30 December, 2021, 11:15:43 am »

I have found a 9 speed cassette 11- 40 which I would like to use on my new trike. I can find 10 speed mechs that can cope but I can't find a 9 speed one. Anyone have any Ideas?.
Thanks for any help

FifeingEejit · « **Reply #1 on:** 30 December, 2021, 11:25:46 am »

Wolftooth or similar?

9 speed mtb predated people going silly so probable claimed max on a long cage will be about 36?

Could try it and see and put an extender in the hanger if needed?

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cycleman · « **Reply #2 on:** 30 December, 2021, 12:26:16 pm »

Wolftooth supply the hanger extention?. Thanks, that may well solve the problem 😀

Cudzoziemiec · « **Reply #3 on:** 30 December, 2021, 12:48:35 pm »

I have a feeling Sram might do something suitable. Not sure which though.. $:-\$

FifeingEejit · « **Reply #4 on:** 30 December, 2021, 01:00:56 pm »

Suggestions are that the long cage mechs may be able to cope with 40 with the b screw or a longer one, might be worth a shot first.

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Duckfoot1606 · « **Reply #5 on:** 30 December, 2021, 01:01:37 pm »

Spa cycles do a hanger extender too 👍

FifeingEejit · « **Reply #6 on:** 30 December, 2021, 01:02:23 pm »

Quote from: Cudzoziemiec on 30 December, 2021, 12:48:35 pm

I have a feeling Sram might do something suitable. Not sure which though.. $:-\$

Just spend 20 grand on eagle, it'll self destruct in 2 weeks like all good SRAM products.

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FifeingEejit · « **Reply #7 on:** 30 December, 2021, 01:04:17 pm »

Actually just realized you never said how many gears you want up front.

What I have noticed is the recent 9spd 40t cassettes appear to be used in 2x and 3x set ups not the 1x delusion.

(im really setting my stall out on 1x here ae no)

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grams · « **Reply #8 on:** 30 December, 2021, 01:10:41 pm »

A 36t-rated mech will likely do 40t without needing an extension, as Shimano are quite conservative.

Quote from: FifeingEejit on 30 December, 2021, 01:04:17 pm

What I have noticed is the recent 9spd 40t cassettes appear to be used in 2x and 3x set ups not the 1x delusion.

Where? Large cassettes are usually intended primarily for 1x use.

But yeah, if you're combining with a double/triple you're going to have to be careful with chain length and avoiding small-small combinations.

FifeingEejit · « **Reply #9 on:** 30 December, 2021, 01:12:43 pm »

That's why I mentioned it, was a couple of threads on single-track I found earlier and can't find now

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FifeingEejit · « **Reply #10 on:** 30 December, 2021, 01:13:58 pm »

https://singletrackworld.com/forum/topic/sunrace-9-spd-11-40-breathing-life-back-into-9-speed-group-set-on-a-27-5-heckler/

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FifeingEejit · « **Reply #11 on:** 30 December, 2021, 01:16:54 pm »

Can't help but think the gear jumps must be pretty horiffic for road use on a 9 and they do 8 to...

But I have bugger all cadence range

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Kim · « **Reply #12 on:** 30 December, 2021, 01:34:27 pm »

Quote from: grams on 30 December, 2021, 01:10:41 pm

But yeah, if you're combining with a double/triple you're going to have to be careful with chain length and avoiding small-small combinations.

Recumbents are generally more forgiving of this sort of thing. The weight of the longer, partially enclosed return-side chain acts as a tensioner, and mostly behaves as long as you don't backpedal too much. Until it gets so slack that it's dragging on the ground...

cycleman · « **Reply #13 on:** 30 December, 2021, 01:51:38 pm »

The plan is to use a triple on the front, 42-32-22. The idea is that I can spin while climbing 1in3 hills at nearly zero mph possibly with a trailer on the back. Gravity takes care of the downhills

FifeingEejit · « **Reply #14 on:** 30 December, 2021, 08:50:13 pm »

At 1 in 3 my 2 wheeled bicycle gains two feet

OK from around 10%

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Kim · « **Reply #15 on:** 30 December, 2021, 09:04:05 pm »

Quote from: FifeingEejit on 30 December, 2021, 08:50:13 pm

At 1 in 3 my 2 wheeled bicycle gains two feet

The 24" gear is a lot more practical on an upright bicycle than it is on a recumbent tricycle (which is generally pulled - backwards in the case of tadpoles - when propelled by hand). With balance a non-issue, it's entirely reasonable to want to gear down to the limit of traction.

rogerzilla · « **Reply #16 on:** 30 December, 2021, 09:29:45 pm »

Why not use a 10 speed one? The cable pull ratio only changed for 11 speed. I have a 7 speed bike with a 10 speed mech!

grams · « **Reply #17 on:** 30 December, 2021, 09:50:59 pm »

The cable pull on MTB rear mechs changed with 10 speed. Likewise modern road 10 speed (Tiagra 4700 and GRX) have 11 speed cable pull.

So there are no Shimano 10 speed long cage rear mechs with 9 speed compatible cable pull.

One option here is to graft a long cage to a body with the correct cable pull. I have an ultra long cage 5800 mech like this one from back when you couldn't buy such a thing. Finding compatible parts is non-trivial, however.

The other option is to buy something like this from the big rock candy mountain.

FifeingEejit · « **Reply #18 on:** 30 December, 2021, 10:39:47 pm »

Quote from: Kim on 30 December, 2021, 09:04:05 pm

Quote from: FifeingEejit on 30 December, 2021, 08:50:13 pm
At 1 in 3 my 2 wheeled bicycle gains two feet

The 24" gear is a lot more practical on an upright bicycle than it is on a recumbent tricycle (which is generally pulled - backwards in the case of tadpoles - when propelled by hand). With balance a non-issue, it's entirely reasonable to want to gear down to the limit of traction.

I was thinking of my knees rather than balance or traction concerns.

Edit: But actually yeah I suppose if balance isn't a problem you can be going as slow s you want.

cycleman · « **Reply #19 on:** 10 January, 2022, 09:26:11 pm »

Just to update this azub.eu are going to fit a 11-40 9 speed cassette from st John Street cycles and a gear hanger from the same place. Now I'm just hoping it's going to work 🙏

Cudzoziemiec · « **Reply #20 on:** 10 January, 2022, 09:42:06 pm »

Hope it goes well.

cycleman · « **Reply #21 on:** 11 January, 2022, 06:03:38 pm »

Coming to a hill near you soon..............