just bought a Croix de Fer with shimano 105 50/34 with 11 speed 11-32. Want to use it mostly for touring, so can I put a 11-34 straight on the back?
thanks
34 cog with new 105?
Re: 34 cog with new 105?
I think you can try; if you have enough chain length (to allow the big-big gear to at least run without breaking anything) and 4mm clearance between the mech and the sprocket with a 32 the 34 might work OK.
If you have to wind the 'B' tension screw very far to get enough mech clearance, you may find the shifting on the smaller sprockets gets a bit iffy.
Shimano's specification assumes a certain dropout length; if your dropout is slightly longer than that (many are) you may be able to run 34 with no issues.
cheers
If you have to wind the 'B' tension screw very far to get enough mech clearance, you may find the shifting on the smaller sprockets gets a bit iffy.
Shimano's specification assumes a certain dropout length; if your dropout is slightly longer than that (many are) you may be able to run 34 with no issues.
cheers
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~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~
~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~
Re: 34 cog with new 105?
Hi Miguel
In addition to Brucey, assuming that your Croix is using the 105 RD5800-GS, the docs say that the maximum capacity on that is 37-tooth. Switching to a 11-34 cassette would give you a tooth-difference of 39. I suppose if you were touring then you won't need an 11-tooth top gear so get a cassette with a small sprocket of no less than 13 teeth (I believe 14-34 is easy enough to come by).
Hope this helps.
In addition to Brucey, assuming that your Croix is using the 105 RD5800-GS, the docs say that the maximum capacity on that is 37-tooth. Switching to a 11-34 cassette would give you a tooth-difference of 39. I suppose if you were touring then you won't need an 11-tooth top gear so get a cassette with a small sprocket of no less than 13 teeth (I believe 14-34 is easy enough to come by).
Hope this helps.
Re: 34 cog with new 105?
That 14-34 cassette sounds a good idea. Where can you get that?
I'm a trendy consumer. Just look at my D5803 using hovercraft full of eels.
I'm a trendy consumer. Just look at my D5803 using hovercraft full of eels.
Re: 34 cog with new 105?
I had this very situation. A 34 tooth cog worked but it rubbed the top jockey wheel even with the "b" screw all the way out. I fitted a Lindarets Roadlink from 18bikes and the problem was solved. I could have fitted a much bigger cog if I had needed it.
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Miguel Evans
- Posts: 66
- Joined: 15 Jul 2010, 6:15pm
Re: 34 cog with new 105?
Thanks Guys
I had to look up the Roadlink thingy, but that certainly is clever! I've decided to toughen up and ride the 32 for now. Will probably go for the 34 when I have worn out the cogs/chain/back.
I had to look up the Roadlink thingy, but that certainly is clever! I've decided to toughen up and ride the 32 for now. Will probably go for the 34 when I have worn out the cogs/chain/back.
Re: 34 cog with new 105?
Hi Miguel
Sorry for the delay, I've been offline for a bit.
I honestly thought that it would be easy enough to find a road cassette with a small sprocket of 13-14 tooth but I've not been able to track one down! Mountain bike cassettes (see SRAM) offer some crazy-big sprockets but they will not work with your 105 mech.
So, yes, impractical advice! You'll get used to the 32-tooth sprocket with practice anyway
Sorry for the delay, I've been offline for a bit.
I honestly thought that it would be easy enough to find a road cassette with a small sprocket of 13-14 tooth but I've not been able to track one down! Mountain bike cassettes (see SRAM) offer some crazy-big sprockets but they will not work with your 105 mech.
So, yes, impractical advice! You'll get used to the 32-tooth sprocket with practice anyway