1×11 setup will this work?

Hi

My current setup is a triple 26-36-48

I have checked the gear ratio calculator and the following setup would be perfect for me although losing a few mph at the top end.

1.Shimano Deore RD-M5100-SGS 11-speed rear derailleur

2.Shimano Deore CS-M5100 11-51 cassette

3.Single 38, 40 or 42 chain ring. Whichever will fit.

4. Xt shifter

What are limiting factors of using the above sized chainrings in either tooth count?

Would they physically fit without fouling the frame?

How would i go about checking what size chain ring I can use?

Thanks

What are limiting factors of using the above sized chainrings in either tooth count?

Those are big rings. Not sure what or where you ride but for mtb personally I’d not be going that big at the front, I’d put a smaller lighter cassette on the back instead of a heavier one and turning the top end of the cassette in to (for me) tarmac gearing.

Would they physically fit without fouling the frame?

How would I go about checking what size chain ring I can use?

You might get lucky and find the max single ring size is available on tinterweb somewhere, otherwise its pretty much trial and error.

I’d suggest sticking with your 36 to start with. Leave your front mech on place to act as a guide whilst you’ve got a shift ring on but give it a try and see how it goes then get a bigger /same /smaller non shift ring as you find you want.

Hi

Sorry I should have mentioned. It’s for my commuter bike. No off road action at all.

Reason for change is. Rear derailleur bent and cassette missing a tooth.

Thanks

+1 sounds like gravel bike gearing…

–What are limiting factors of using the above sized chainrings in either tooth count?
A: you’ll need a pretty long chain, so watch out with the 114 link versions, just in case.
A: the gearing is still pretty high, as suggested

Would they physically fit without fouling the frame?
A: depends on your chainstays. In the middle ring position, how much clearance does the current 36t have? That should give you some idea.

How would i go about checking what size chain ring I can use?
A: trial and error. I run much lower gears than this, but maybe you are super strong…

ah okay

If you go 40t+ then you can always fit the ring in the outer position, to clear the chainstay. The chainline isn’t quite as good but it’ll be okay.

If it’s for commuting then do you need 11-51? A narrower cassette would be lighter and have smaller gaps.

Sorry I should have mentioned. It’s for my commuter bike. No off road action at all.

Reason for change is. Rear derailleur bent and cassette missing a tooth.

Ah.

I’d honestly say keep what you’ve got and just replace the bits that need replacing. Single ring on the road doesn’t really serve much of a purpose.

Just before my house is a very very long steep hill hence the choice of cassette. Only rimeni need the granny gear.

I was just seeing what my options are.

I have around 10-15mm space between the middle 36 and frame.

It will be a single ring upfront not all three.

Cheers

You could just fit the new mech and a new cassette and just try it with your existing middle chainring to see if you like 1x.

I use a 26/36 x 11/36 on my commuter. I only use the granny when towing our tag along.

I’d try a 36 or 38 ring and maybe a 11/46 or 11/42.

If you’re set on going 1x there are plenty of wide range cassettes available which will fit 9 & 10 speed, so unless you’re running 8 or less I honestly wouldn’t touch the shifter.

11 isn’t not giving you anything over a similar range 9 speed but fot slightly more spread and, if you’re at all bothered about ratio jumps, 1x is going to be a backwards not forwards step.

I currently ride about 10km to/from single track and the 11T/34T keeps a constant 30-35km/h where I can without spinning out on 27.5 wheels. On a couple of hills I probably go a tad faster down but I’m usually happy to freewheel those….

Excellent advice guys.

I think I may have mixed up my gear ratios.

The hill near my house. I use the

Small ring from the triple and second/third cog from the bottom of the cassette.

What are my options then in regards to a 1×10 or 1×9 setup keep the high and low gears as close as possible.

Thanks

to a 1×10 or 1×9 setup keep the high and low gears as close as possible

What cassette are you currently running?

By two from bottom I assume you mean third largest at the rear?

I used to use lots of gears …. when I went 1×10 I found I didn’t actually NEED them… I just used them because they were there.

I was out the other day and did what is for here a long, steep hill on the road… (Komoot says 140m) and I don’t think I used the 42T or even the 36T and I wasn’t in any rush… or that fit.

I use 1 x 10 on my road bike with a 42 chainring and 11 – 28 cassette. The only time i notice the big jumps in ratios is on the turbo but still less hassle than a 2x setup.

What are my options then in regards to a 1×10 or 1×9 setup keep the high and low gears as close as possible.

If you’re going 1x I personally wouldn’t bother with 1×9 or 1×10 unless you’re trying to reuse older/existing/secondhand stuff to make it work.

I have been there and done that 🙂 and yes it’ll work, but the limitation is finding a mech that will work nicely with larger range cassettes. You can generally exceed the manufacturer’s recommendation on max tooth count a bit and be OK, but to an extent you’re always bodging it a bit. (Furthermore, the chances of getting a clutch mech are slim to none, although that doesn’t matter for road commuting I imagine).

There are of course a couple of newer 1×9 and 1×10 setups from e.g. MicroShift (Advent and Advent X) which were designed for wide-range cassettes. I like the sound of these, but once you’re into “buy a new mech, cassette, and shifter” territory there has to be some compelling reason to stick with 1×9 rather than going e.g. Shimano 1×11 for similar money.

For me the M5100 stuff looks pretty compelling.

What cassette are you currently running?

11-36 with 26-36-48 triple

By two from bottom I assume you mean third largest at the rear?

Sorry got mixed up. That would be the 26 ring and 23 or 26 on the cassette.

For me the M5100 stuff looks pretty compelling.

From looking around its a £130-£150 upgrade, this was a quick look.

I used to use lots of gears …. when I went 1×10 I found I didn’t actually NEED them… I just used them because they were there.

I was out the other day and did what is for here a long, steep hill on the road… (Komoot says 140m) and I don’t think I used the 42T or even the 36T and I wasn’t in any rush… or that fit.

Wow Komoot is awesome lol. I just checked and that hill near me is 480ft