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Sorry ... New to this roadie lark!
If I have a 2x10 set up and want to change my cranks to a triple rather than the double ... Do I also need to change the left hand shifter?
Thanks in anticipation
Yes
Unless you have a very good reason for this, may I suggest you have a think about rule #5 and reconsider.
Yes you do need to change.
Unless you're touring don't bother though as you can achieve the same with a wide range cassette.
Thanks
.... Rule #5?
Yes, sorry.
Which might make it with seeing if you can get the ratios you need with a double - SRAM do their 'wifli' stuff which is basically a big cassette (up to 32, I think) and a long cage rear mech to accommodate the extra range. Might be cheaper than new cranks and a shifter.
Unless you have a very good reason for this, may I suggest you have a think about rule #5 and reconsider.
Relevant as rule 5 often is, you also don't need to go down the route of a triple to get low gearing.
As long as you've got a compact (50/34) not a STD (53/39), if you're running 9 or 10spd you can readily run an 11-32 cassette in conjunction with a medium cage mech, giving you an almost 1:1 bottom gear that you would normally get with a Triple chainset.
.... Rule #5?
Rule 5 of being a roadie:
Rule # 5
Harden The **** Up
Other posters are right on, a wide range cassette will probably be enough to give you the ratio your looking for. Use Sheldon Browns gear calculator to get an idea of what you can get with a triple and your current cassette vs your current double and a wide range cassette.
More helpful answer this time. Rule 5 is a reference to http://www.velominati.com/the-rules/.
All the people saying to get a wider range cassette are right. You should be able to lower the bottom gear enough to make a difference for just the cost of a cassette (Assuming you have compact chainset ). It worked for me.
EDIT: I'm a bit slow tonight
**** the rules.
I ride my bike to get away from all that shit.
There are some shifters that are double/triple compatible. The unreliable early 5600 105s were, I think. But like others have said a wide range cassette and possibly a compact chainset is the easy option.
Cheers all
Gary_C .... Me to!! ... I'm 53 and really can't be arsed H'ing TFU .... I'd rather just mellow then rot! 😉