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tonton_tapis

Rear mechs

Money is a bit tight at the moment and I need a new rear mech for my MTB. Shopping around, I have noticed that Sora/Tiagra long cage mechs are usefully cheaper than Deore/LX mechs. Looking at my road bike (new Tiagra) and my MTB (old LX) I cannot see why they should perform differently and why I shouldn't save 5 to 10.
Do MTB mechs have stronger springs perhaps?
Any thoughts?
Thanks
JB

They might have slightly stronger springs but the main thing I'd want to check is the leverage (for want of a better word) - i.e. whether road and mountain bike shifters both pull the same amount of cable through with each gear shift, I've got a feeling they don't.
tonton_tapis

JB wrote:
They might have slightly stronger springs but the main thing I'd want to check is the leverage (for want of a better word) - i.e. whether road and mountain bike shifters both pull the same amount of cable through with each gear shift, I've got a feeling they don't.


Thanks JB. I will have a look at hybrid/tourer/urban bikes to see what combination of shifters/mechs they use. Am sure that some do mix MTB and road groupsets. My MTB is getting to the stage that a number of bits are needing replacement and the combined value of the new parts is getting towards half the value of a new Rockhopper (or similar).
trirob

sorry to hijack this thread, but i've recently purchased a groupset for a bike i'm building, and i've bought cranks which are 175mm. However, my current winter bike, and old racer both had 172.5 mm cranks.

is the extra length going to make a huge difference, i'm 5ft 9.

Also, if it is, can i change cranks easily enough, or would i be better changing the chainset?
headwind

trirob wrote:
sorry to hijack this thread, but i've recently purchased a groupset for a bike i'm building, and i've bought cranks which are 175mm. However, my current winter bike, and old racer both had 172.5 mm cranks.

is the extra length going to make a huge difference, i'm 5ft 9.

Also, if it is, can i change cranks easily enough, or would i be better changing the chainset?


In my, albeit limited, experience, that wont be a huge deal if your body is generally adaptable...some riders have real strict tolerances others can be close and its fine...Im in the latter group...that wouldnt be a big deal to me.
trirob

i'm not sure if i would want to change too many variables with regards riding as i'm prone to injury as it is. i'll have to talk to my local bike shop for advice although they'd probably end up trying to sell me something

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