40T, 42T EXPANDER ...
 

[Closed] 40T, 42T EXPANDER GEAR.

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Hi,
Who uses a expander gear on a 1x10 29er?
My concerns are,
will the chain, rear mech require some modification?

I currently run my 29er with a 36 chain ring with a XT 10 speed 11-36 cassette but on the really long, hard and steep Yorkshire rides, towards the end of the rides I wish I had that old Granny gear to drop into.
Other than changing the front ring to a smaller one would a 40t rear cog be worth a try?
Who uses one and how do you find it?
Thanks.


 
Posted : 06/05/2014 7:36 pm
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I use a hope T. rex on my 29er hardtail, only advice is a16t cog


 
Posted : 06/05/2014 8:06 pm
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Yeah,
Just converted my Anthem 29 to 1 x 10 with a 42t One up sprocket.
Had issues using a Dura ace 16 tooth to even out the spread.
Put a 16 tooth XT sprocket in and sorted it out.
A bit of fine tuning was needed but working well now.
Running a 32t narrow wide to give the same bottom gear as my double set up.
Top gear is a bit spinny on road but fine off road.
Mite put on a 34 narrow wide for local runs.
Thanx,
Max


 
Posted : 06/05/2014 9:47 pm
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Where's the best place to get a 16t XT sprocket from?

Thanks


 
Posted : 08/05/2014 1:12 pm
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rose bikes for 16t, they are only about £4 but postage is something silly like a £10


 
Posted : 08/05/2014 1:48 pm
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There was always €10 off at Rose if you like them on facebook, should cover the postage


 
Posted : 08/05/2014 1:58 pm
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I'm running the hope t-rex with no problems. Went from a 30x11+36 to a 32x11-40. Gave me a bit lower and a bit higher gear, but I do live in Surrey. I haven't bothered with the 16t sprocket, and I haven't noticed tbh.


 
Posted : 08/05/2014 2:19 pm
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If you go with the Oneup version, they are now including a 16t. Installed mine last week (26er) and it's great. Has definitely put the brakes on me shelling out for 1x11


 
Posted : 08/05/2014 2:51 pm
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Why does having a 29er make an "expander" gear any more or less good/optimum/cool/rad *delete as appopriate?


 
Posted : 08/05/2014 3:13 pm
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Why does having a 29er make an "expander" gear any more or less good/optimum/cool/rad

Eh? Because the wheel size means that gearing is higher, so having a lower "expander" is more optimum/good/cool/rad if you are struggling with your current gearing.

Or have I miss understood your question?


 
Posted : 08/05/2014 3:16 pm
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If the gearing is higher due to being a 29er, you compensate by running a smaller chainring Shirley?


 
Posted : 08/05/2014 3:28 pm
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To be fair, the OP is considering a smaller chainring, but is asking of the pluses and minus of an expander and it gives a bigger spread of gears, which is obviously true whatever the wheelsize.

I've just got a Hope 40T and it works fine. I must admit that there is a loss in shifting quality due to adjusting the b-tension a bit, but it still works fine.


 
Posted : 08/05/2014 3:58 pm
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Yep, you just get a larger spread of gear ratios on 1x10. Compensates for being weak and feeble.


 
Posted : 08/05/2014 3:58 pm