Bike gear modifications to ease climbing with a loaded setup
FR

Translated into English.

Original post
SP
Hello fellow cycling friends,

I’m heading out very soon for a few weeks in France and elsewhere on my trusty two-wheeled steel steed, with a total of me + luggage = around 120 kg gross weight, and I’ve never really tackled mountain passes before—something I’ll definitely be facing this time...

Currently, I’m running 700c wheels and a Deore XT 10-speed drivetrain (long-cage derailleur) with a 26/36/48 chainring setup and an 11-36 cassette. I’m considering two options (and possible modifications) to get a lower gear ratio (currently 0.72) and spin more easily on steep and mountainous climbs...

1 – Install an 11-42 cassette This would give me a gear ratio of 0.61. Would this be feasible with my current rear derailleur, please?

I have several new chains with 116 links—would these work for this cassette, which would have 6 more teeth on the largest cog, or would I need a longer chain?

2 – Swap the 26-tooth small chainring for a 24-tooth one This would give me a gear ratio of 0.66. Would this be feasible, please?

When switching to a 24T, will the gap be accepted by the 36-tooth middle chainring, and will shifting remain as smooth as it is now? Will this setup (24/36/48 + 11-36 cassette) still work well together, in your opinion?

Which of these two options do you think would be more feasible and preferable?

What drivetrain and gearing do you use on your bikes for loaded touring that sometimes involves climbing mountain passes and other steep ascents?

So many questions... Thanks for your answers and advice! Have a great day,

Spady
ET Etchelecou Regular ·
Hi Art, I ride in the mountains with a 26" and I’ve set it up with Shimano Deore XT, 3 chainrings (22 x 32 x 42) and 9 cogs (from 34 to 14). The smallest gear (22 x 34) is super useful on 10%+ gradients when loaded up to a total weight of 120 kg (rider, bike, panniers). It lets me spin at around 4-5 km/h and climb without too much trouble. Worth considering with 700c wheels. André ddvagabondages.fr
André Etchelecou http://ddvagabondages.fr
LE Lethieu Globetrotter ·
36 to 42 ... about 20 cm less around the bottom bracket ... you're dealing with very small differences on terrain where pedaling cadence is low (especially when standing up), so achievable speeds range from 5.4 to 6 km/h even with a cadence of 75 rpm. Anyway, you end up at a speed that doesn't exceed walking pace, where it's hard to maintain balance ... Why make modifications that might not even be compatible with your drivetrain in that case? Managing mountain passes will be like for many others: short stops, breaks, and sometimes walking a few dozen meters ... when traveling, you adapt, you make do ... the main thing is to get going ...
michel mathieu www.lethieu39.fr
SW Swissrider Regular ·
It looks like you, like me, have a bike equipped with Shimano’s touring groupset based on your description. The 11-36 combo with 26-36-48 chainrings works well with 26-inch wheels, but with 28-inch wheels, the gearing is a bit too long. When I’m all the way to the left with the chain, I’m doing about 6 km/h at 60 RPM. The ideal is more like 5 km/h at 60 RPM in the easiest gear.

The derailleur is limited to a 36-tooth cassette. It seems that with Shimano, you can go up by two teeth, but not more. I haven’t found a cassette with a 13-38 combo. For the chainrings, you can actually fit a 22-32-44 set, which is designed for 9-speed groups but works fine here. The tooth width is the same for 9- or 10-speed. Personally, I ride a Decathlon RT900, and on my next chain change, I’m going to switch to 22-32-44 chainrings up front. I also prefer steel chainrings because aluminum wears out too quickly, and the 36-tooth chainring dies with every chain change.
SP Spady ·
36 to 42 ... about 20 cm less around the crankset ... we're looking at very small differences on terrain where pedaling cadences are low (especially when standing up), so achievable speeds between 5.4 to 6 km/h despite maintaining a cadence of 75 rpm.... Either way, you end up at a speed that doesn’t exceed walking pace and where keeping your balance is tricky ... So why make modifications that might not even be compatible with your drivetrain? ... Managing mountain passes will be like for many—short stops, breaks, and sometimes walking a few dozen meters ... when traveling, you adapt, you make do ... the main thing is to set off ...

Good evening Lethieu, Thanks for your feedback. If needed, I’ll go with your advice—"adapting with short stops, breaks, and sometimes walking a few dozen meters..."—since in my setup, the 11-36 cassette is the maximum size.

If it interests you or others to avoid unnecessary purchases, after some online research, to check cassette compatibility with a rear derailleur, we talk about the derailleur’s total capacity. For the Deore XT 10-speed, it’s 26/36/48 and 11-36 with a 47-tooth capacity. Here’s how to calculate it:

1. Maximum front capacity The maximum capacity is the size of the largest chainring, i.e., its number of teeth, minus the number of teeth on the smallest chainring.

2. Rear difference Do the same calculation for the rear sprockets.

3. To calculate the total capacity, add the maximum front capacity to the rear difference.

Regarding my derailleur: Large chainring: 48 teeth Small chainring: 26 teeth Maximum capacity = 22 teeth (48-26)

Large sprocket: 36 teeth Small sprocket: 11 teeth Rear difference = 25 teeth

Total capacity: 47 teeth (22 + 25)

Note: This calculation applies to any drivetrain—you just need to know your derailleur’s total capacity to adjust accordingly, or know your chainrings/cassette to match a derailleur.

A 11-42 cassette wouldn’t work since the total capacity would be 53 teeth... Nor would a 24-tooth chainring to replace the 26, as far as I know, because the total capacity would still be exceeded. In both cases, from what I’ve read, this would cause the derailleur to drag and the chain to struggle shifting smoothly over the relevant sprockets and chainrings...
SP Spady ·
Hi Art, I ride in the mountains with a 26" bike and I’ve set it up with Shimano Deore XT, 3 chainrings (22 x 32 x 42) and 9 sprockets (from 34 to 14). The smallest gear (22 x 34) is extremely useful on 10%+ gradients when loaded, with a total weight of 120 kg (rider, bike, panniers). It lets me spin at around 4-5 km/h and climb without too much trouble. Worth checking out with 700c wheels. André ddvagabondages.fr

Hi André, Thanks for your reply. Your smallest gear is close to mine, the difference is probably noticeable due to your 26" wheels compared to my 700s. I seem to manage around 7 km/h on climbs... I’ll stick with my current setup of 26/36/48 and 11-36.

PS: I’ve posted a detailed reply above/below to Lethieu about how to calculate compatibility between cassette and derailleur.

Thanks again, and have a great weekend!

Spady
SP Spady ·
Like you, it seems I have a bike equipped with Shimano's touring groupset based on your description. The 11-36 combo with 26-36-48 works well with 26" wheels, but with 28" wheels, the gearing is a bit long. When I'm all the way to the left with the chain, I'm doing about 6 km/h at 60 RPM. The ideal is around 5 km/h at 60 RPM in the lowest gear. The derailleur is limited to a 36-tooth cassette. It seems Shimano allows two extra teeth, but not more. I haven't found a cassette with a 13-38 combo. For the chainrings, you can actually use a 22-32-44 setup, which is designed for 9-speed groupsets but works fine here. The tooth width is the same for 9 or 10 speeds. Personally, I ride a Decathlon RT900, and on my next chain change, I'll switch to 22-32-44 chainrings up front. I also prefer steel chainrings because aluminum wears out too quickly, and the 36-tooth chainring dies with every chain change.

Thanks for your feedback. After some research, I can confirm that for the Deore XT 10-speed derailleur, the maximum cassette size is indeed 11-36. If you're interested, I gave a detailed response above to Lethieu with calculations to determine the right cassette/derailleur compatibility. On flat terrain with little elevation, I like 700c wheels because even when loaded, I sometimes like to push harder using the smallest cogs and the 48-tooth chainring. I’ll consider switching to 24-32-44 chainrings later. Thanks again! Have a great weekend, Spady
KO Koaclarck Regular ·
Hey,

Good idea to switch to a 36-tooth cog at the back. And for the front, the derailleur will easily handle switching to a 22-tooth chainring. I’ve done it on a similar drivetrain—I went with 22-36-48. Even with indexed shifters, it works fine. But I still went back to a smaller 24-tooth chainring to smooth out the gear combinations. Now I have 24-36-48, in 12-tooth increments. And it works great.

Hope this helps! :)

Matt
Le vélo, c'est bien, même pour celleux qui n'en font pas.

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