OneUp 42T with a 2x10 front for Bikepacking

[blurltd]

I have this question on MTBR with no bites.

Anybody running this? I'm looking to set up my off road adventure bike with a 42 cog with a 36/22 front. YES, I know that OneUp states that 26 granny is the lowest due to the amount of torque. But I still see guys that are rolling with it. See link below

https://www.facebook.com/OneUp.Compo...type=1&theater

There was also this question on one of the threads:

This inquiring minds type question is directed to OneUp.

In regard to running a 2x10 setup with the OneUp cog, the OneUp website says, "We don’t recommend using anything smaller than a 26T granny. With the extra torque you’re making we wouldn't want you to damage your freehub."

When you mention damaging the freehub, are you referring to the cog cutting into the freehub body or the freehub ratchet mechanism (pawls and teeth) becoming damaged? I ask this because I'm running a Hadley which uses a titanium freehub body, so I'm not too worried about the cog digging into the freehub body, but I am worried about the cog damaging the ratchet mechanism.

OneUPs Answer:

Sorry for the ambiguity. We are referring to the pawls and teeth. I know shimano hubs had issues when guys were running a 20T granny with 11-36 cassettes. A 26T w/ our 42T is roughly equivalent to a 22T w/ a regular 36T.

If you have a beefy hub it likely isn't a problem. We're just trying to get people to think through their setups a bit before breaking something.

- Team OneUp


That said, anybody out there running a 42 with a 36/22 front? Long cage or Medium cage rear? I plan on running this with my King hubs
on a steel hardtail.

Yes I know it would be a SUPER LOW gear and I could walk up a steep hill faster. With a slighly injured knee I need all the help I can get. Plus getting off and pushing jacks up my knees so I'd rather just sit and spin a few inches an hour vs pushing. Plus it's more of like a "just in case" cog, i'd normally be in the 36 cog most of the time.

So if you've been running this, let me know how it's working for you.

[hikernks]

I'm running it 2x10, but I have 42/28 on the front.  Right after I ordered mine, they came out with the 40t, and that's what I'd go with if I had to do it again.  I have a few rides on mine with zero issues, but do NOT shift onto it when you're in the big ring, haha.  Oops.  As far as speed, a guy at the LBS converted the gear inches, and we came up with a cadence of 80 would give you 1.8mph, lol, and that seems about right.  A couple of things: you end a long-cage rear der, and make sure your cassette is compatible, otherwise you'll need a new one.  Hope that helps!

[NT]

I'm interested in this as well (also have knee issues). I'm running a 20 tooth granny against an 11-36 stans hub on a 29er hardtail. No issues so far but I haven't put a ton of mileage in that gear yet.

[blurltd]

I've got the parts ordered, I'll let you know how things turn out.

[Racingguy04]

I'll definitely anxiously await your report of how it goes, I'm running a sram 2x10 right now and I've been pretty curious about how one of those big granny gears would work cause I frequently find myself walking.

[bmike-vt]

Same here. Fargo gen2 with 2x10. I have the 28-42 up front and. 12?-36 out back. Have debated going to the 26t or 24t front - but I need to get a different crank. The 40 or 42 rear sounds just about perfect for what I need.

[blurltd]

This works! Now I don't have a lot of time in the saddle and due to my injury I haven't ridden with it fully loaded so I don't have a long term report for you guys. After my tour of the Great Divide in June I will let you know.


Here's my exact set up for those that want to try it out.

Sram X9 36/22 with bashgard Crankset
Sram X9 2x10 front derailleur
Sram X9 LONG CAGE rear derailleur
Sram 1070 12/36 Cassette front derailleur
One Up 42T Cog
Chris King Heavy duty rear with stainless steel drive shell and Fun Bolts

I probably would not try this set up with the Chris King Aluminum drive shell as the cassette body really digs into the aluminum drive shell.

Shifting is fine, but don't expect it to perform as it would like it should on your single track slayer trail bike. It's GREAT but don't expect super fast shifting like you would if it were and 1x11 or 2x10 groupo set.