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Post by Rlo80 on Dec 17, 2015 19:48:50 GMT
Trying to decide which combo to go for...bearing in mind I live in Sheffield (hills and more hills) and I like to join Glynn on his rides which tend to be vertically challenging!? Lol
Hardtail 29er had 11-36 cassette with 26-38 rings. This felt good on the big climbs, maybe I could go a bit heavier but not much.
The FS 27.5 will have 34T at the front and I can't decide which cassette...42 or 40? The mech is medium cage and I've read 42 puts a bit of strain on the mech and hesitant gear changes and will probably require more tuning...maybe this is why the XTR cassette only goes up to 40T...I'm planning to go XT which gives me both options.
Anyone runs a 34 chainring and if so, which cassette? Suggestions?
Thanks in advance
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Post by glynnsixo on Dec 17, 2015 20:37:22 GMT
sorry gonzalo, never used 1x10 or 11 for peaks climbs so cant help, you might find its a bit of trial and error to suit your preferences. there is a way of working out ratios mathematically but i dont know it....................i havnt been much use have i?  |
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Post by kirky72 on Dec 17, 2015 20:38:56 GMT
34front with 40t is quite tough. I've been running on a 27.5 a 30t with 42 and that was great but a little creamer, just gone down to 40t at the back and can already feel it and miss the 42 and that's without venturing to the peaks. There are some on line gear ratio tools that will tell you the exact range of gearing, you could put in what you used to use and compare it to what you are thinking of running then you'll have confidence that you have the range you need or at least used to. This is a good one. www.sheldonbrown.com/gears/Going from your before and proposed after your original set up had a ratio of 7 to 1.5, a 34t to 40t would have 6.2 to 1.7 , your old gearing had a 1.6 and 1.5 gearing which was your granny in the 32 and 34. If you never used them you'll be fine if you did the. You can achieve the same 1.5 ratio by using a 32t chainring with a 42t cassette or for a little less high speed but smoother shifting a 30T chainring with 40t cassette. Oh you don't need to check now. |
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Post by glynnsixo on Dec 17, 2015 20:39:39 GMT
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Post by Jan on Dec 17, 2015 21:03:11 GMT
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Post by Jan on Dec 17, 2015 21:09:59 GMT
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Post by Marmite on Dec 17, 2015 22:10:15 GMT
I use a 30 on front on my 29er but I'm a lazy slob when it comes to climbing  with a 42 on the back wot I can't ride up I push .. But as my fitness is slowly getting better I'm not using the 42t as much .. |
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Post by Rlo80 on Dec 17, 2015 22:27:03 GMT
Thanks a lot guys...sooooo complicated this stuff!
I got the chainring from the US...OneUp components...I suppose it could return it maybe and order a 32...with the 40-11 cassette
Or
Keep the 34 ring and buy the 42-11 cassette and see how it goes in terms of gear changing!? Does anyone use this combo and what's the feel on the changes...and would a medium cage mech cope?
Im also conscious I don't want it to be too "spiny" on the flats, etc. Urgh....!?!?
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Post by Rlo80 on Dec 17, 2015 22:33:10 GMT
Thanks a lot! That was clearer...from that it doesn't look like the 34 with 40-11 would be a lot harder than before?! A little harder but was expecting that anyway. I also used to run 700mm crank and now I've ordered 750mm which should also help a tiny bit I guess! I'm loving this forum! Nice people! |
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Post by Jan on Dec 17, 2015 22:50:13 GMT
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Post by Rlo80 on Dec 18, 2015 6:42:14 GMT
Thanks mate Also thought about that one, but then the strain and jump on the gears would be even worse maybe. From the calculations (thanks for those because it's a lot clearer now), with the 34 - 11/40, it looks like I would only miss my previous top gear...with the 42 I would miss something in between. I actually think I could cope with that...and if not I can add the 42 ring later or even 45. Hopefully, going down to 27.5, longer crank arms and FS, will also help on the climbing overall! |
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Post by roundie1981 on Dec 18, 2015 6:51:29 GMT
I currently run the 11 speed xt gear, 11-42 cassette with a 32 narrow wide this works for me and I'm not super fit.
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Post by windysurfer on Dec 18, 2015 8:55:30 GMT
32 front 10/42 rear for me with 27.5 wheels.
Perfect for my riding round here and the Lakes
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Post by Rlo80 on Dec 18, 2015 9:44:08 GMT
Do you guys run medium or long cage mechs?
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Post by roundie1981 on Dec 18, 2015 10:41:23 GMT
Do you guys run medium or long cage mechs? Medium for me |
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Post by Rlo80 on Dec 18, 2015 13:23:00 GMT
Do you guys run medium or long cage mechs? Medium for me I wonder what difference would it make going 34T at the front tho?! with a 11-42 cassette, will it work OK? |
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Post by roundie1981 on Dec 18, 2015 13:56:05 GMT
I wonder what difference would it make going 34T at the front tho?! with a 11-42 cassette, will it work OK? I should imagine that would be OK, what mech are you looking st getting? |
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Post by Rlo80 on Dec 18, 2015 14:09:06 GMT
I wonder what difference would it make going 34T at the front tho?! with a 11-42 cassette, will it work OK? I should imagine that would be OK, what mech are you looking st getting? I've already bought the new XTR...and the OneUp 34 that is designed to go with the XTR crank...so now it's only the cassette that is missing and I'll either go XT 40 or 42!? |
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Post by Deleted on Dec 18, 2015 14:12:59 GMT
This is all very complicated - all I know is I run a 30t N/W front/11-42 cassette (with expander) on a long cage mech. It shifts fine.
I daren't try 32 at my current fitness level as I wouldn't even get up my drive!
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Post by roundie1981 on Dec 18, 2015 14:15:36 GMT
I should imagine that would be OK, what mech are you looking st getting? I've already bought the new XTR...and the OneUp 34 that is designed to go with the XTR crank...so now it's only the cassette that is missing and I'll either go XT 40 or 42!? I've used a medium mech with a 36 upfront and a 11-36 casette, but not with an expander. You could just go with a 40t? |
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Post by Rlo80 on Dec 18, 2015 16:08:05 GMT
I've already bought the new XTR...and the OneUp 34 that is designed to go with the XTR crank...so now it's only the cassette that is missing and I'll either go XT 40 or 42!? I've used a medium mech with a 36 upfront and a 11-36 casette, but not with an expander. You could just go with a 40t? what I'm going to do is ask the mechanic who will put it all together if a 42-11 cassette with the 34T at the front and medium cage mech works…if it does, ill go with that, if not ill stick the 11-40 cassette since this only removes me the highest gear i had before. Obviously harder, but i probably would manage. thanks for your help guys |
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Post by windysurfer on Dec 18, 2015 20:54:42 GMT
On my old bike I ran a 32 front 42-11 rear 10 speed with a medium cage and could have removed 4 links from the chain before it would have been too tight so I'd say a 34 would fit fine.
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Post by Rlo80 on Dec 25, 2015 13:42:20 GMT
Spoke to the mechanic at the shop who will build the bike...he told me to go 34 at the front with 40-11 cassette...from the ratios it looks like I will be only dropping my previous top gear...I guess I will have to do more squats to build up the quads in advance and remember the rule number 5 a bit more often... www.velominati.com/the-rules/Update- actually exchanged the NW for a 32T and got the 40-11 cassette which gives me pretty much what i had before so i shouldn't struggle too badly on the climbs. Would hate to push the bike just because i got the wrong setup. |
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with a 42 on the back wot I can't ride up I push .. 
