chainsets
loonytoon
Posts: 673
in General Chat
I am looking to but a new chainset for my push bike...
I have currently 7spd HG70 cassette with an HG70 chain machine that current has a sora (I think) really compact (48-36) chainset...the obvious upgrade is to a sora standard 52/39 (or more regular compact (38/50) set up - though this is a debate for another time)
however ribble currentlt have a 105 for 35quid just 5 more than the sora...however (and this is the nub of my question) all the info about the 105 says it is "9spd compatable" - does anybody know if this means that it isnt 7spd compatable?
Ian
p.s. all the above is Shimano...
I have currently 7spd HG70 cassette with an HG70 chain machine that current has a sora (I think) really compact (48-36) chainset...the obvious upgrade is to a sora standard 52/39 (or more regular compact (38/50) set up - though this is a debate for another time)
however ribble currentlt have a 105 for 35quid just 5 more than the sora...however (and this is the nub of my question) all the info about the 105 says it is "9spd compatable" - does anybody know if this means that it isnt 7spd compatable?
Ian
p.s. all the above is Shimano...
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Comments
Contact ribble on 01772729108 (thats the shop number NOT the hotline number). They are pretty handy in there and can answer most of your questions. Incidentally i just changed all my runnin gear through them but made a serious mistake of buying a 9 speed cassette wheras bike bikes sti levers were 8 spd....DOH! I ended up buying 9 spd everything and upgrading hahahaha - expensive but worth it [;)]
I have emailed ribble about this as well but it appears the forum has won the race...
If you have a Sora double at the moment the 105 will be an improvement.
The chainset will not determine whether you can use a 7,8,9,10 speed setup. The rear mech, the STI lever and the cassette will determine that.
If you are changing the size of your leargest chainring significantly you may find that you have to lengthen/shorten (or replace) your chain. It will also depend to a certain amount on whether you have a short or long cage rear mech, there will be less leeway with a short cage mech.
David
Cheers...I was figuring on changing the chain anyway as I am going from 48 to 53 on the largest chain ring (and it has a stiff link which I can't get out).
The reply I got from ribble was that it will work but "may not shift as well as a 8spd chainset"....which sounds like a fairly ambiguoes answer to cover any compatibility problems that may arise...
I will look at my rear mech and see what the crack is..
I was looking at the bottom brackets and they arent that expensive (really) and it will also be an upgrade...
not that I am obsessed by weight but the 105 is 200grms lighter than the sora and the bottom bracket probably runs smoother 2...
will call them be for I order... but this will hopefully end the saga of getting a new chainset...