changing inner chainring, cassette, chain ???

clod71

Hi I have to service the bike and probably change cassette and chain which are a bit worn. I was thinking of changing also the crankset and going from a compact 50-34 to a standard double, but that is very expensive and it isn't an option.
So the question is... is it stupid to buy only a new inner chainring (a 39T for example) in order to make shifting smoother and if it isn't stupid is it doable?
Also to help my legs I was thinking of moving from a 9 speed to a 10 speed cassette and chain... is that also possible leaving the same crankset?
thanks

seamus

I think a 39T ring for a compact is relatively hard to come by, though FSA do a 38T for compact:
http://www.wiggle.co.uk/fsa-pro-compact-road-38t-chainring/

Unless the chainring needs changing, then you can achieve the same thing by getting a smaller cassette. For example, if you moved from an 11-23 to an 11-21, that would be almost exactly the same as changing from a 34T to 38T chainring

The difference of course in changing the front chainring is that a larger chainring means you won't have to change at the front on those annoying steep-but-not-that-steep-but-too-steep-for-the-large-chainring sections, which means less chance of losing your chain.

But I would tend to stick with what you have and save your money for a full size chainset.

Muller_1

You can change the cassette no problem 9-10 speed, but it's always an idea to change the chain at the same time.

You can't change an inner chain ring from 34 to 39 as it won't fit the cranks, you would need to get a new chainset, you may also need a new front derailleur if changing the chainset.

bbosco

Have a look here:
http://harriscyclery.net/product/t.a.-specialites-ta-110-bcd-chainring-39-teeth-1426.htm

There are 39 tooth chain rings that fit 110 BCD cranks, but they're hard to find and therefore often expensive.

clod71

Muller_1 wrote: »

You can change the cassette no problem 9-10 speed, but it's always an idea to change the chain at the same time.

You can't change an inner chain ring from 34 to 39 as it won't fit the cranks, you would need to get a new chainset, you may also need a new front derailleur if changing the chainset.

A new front derailleur as well? I though I could have gotten away with it since I wanted to go from compact to double... Ouch!
That makes the chainset swap a definitive NOT A CHANCE. :cool:
thanks

com1

Is it me or is it Friday or what but would you not need to change your shifter if you went from a 9 speed to a 10 speed cassette - more expensive than a new crankset?

clod71

com1 wrote: »

Is it me or is it Friday or what but would you not need to change your shifter if you went from a 9 speed to a 10 speed cassette - more expensive than a new crankset?

:rolleyes: yeah... it's Friday.

clod71

so the only option I have is get an expensive FSA 38T compatible with 110 BCD and stay on a 9speed. Maybe just change the cassette from an 11-25 to a 12-28 ????

superlav

I have used these to convert a compact crankset to standard

Works perfectly in my opinion.

Your front derailleur will work perfectly well with standard or compact chainrings, although you will have to raise it up a fraction to allow for the larger chainrings.

If changing from 9 to 10 speed you would need a new rear shifter.

petethedrummer

wait now, you want to make this easier on your legs? Then keep the 34 chain ring and get the 12-28 cassette. Don't move to a standard double set up.

A compact will shift smoothly if you learn to set up and maintain it properly.

clod71

bbosco wrote: »

Have a look here:
http://harriscyclery.net/product/t.a.-specialites-ta-110-bcd-chainring-39-teeth-1426.htm

There are 39 tooth chain rings that fit 110 BCD cranks, but they're hard to find and therefore often expensive.

very nice... thanks bbosco :-)

clod71

petethedrummer wrote: »

wait now, you want to make this easier on your legs? Then keep the 34 chain ring and get the 12-28 cassette. Don't move to a standard double set up.

A compact will shift smoothly if you learn to set up and maintain it properly.

no, I was only saying that to compensate the jump from a 34T to a 39T I could have gone to a 10 speed so to have one more gear for those rare hard climbs... but most likely this isn't going to happen

Flandria

You can get 38/39s 110bcd. As others have said a little expensive but FSA and Look do them. In fact Cycle Superstore put a 38 on a compact for me recently - they had to order it in but it only took a week. Give them a call

The 38 WILL help your legs, just not necessarily in the way you might want;)

mirv

I've got a no-name brand 53/42 175mm JIS (shimano) square taper crankset on my Raleigh SF 1.0 that I'd happily swap for a 170mm compact if you're interested (so long as my derailleur is happy to shift up and down the compact?) Based in walkinstown and can meet up with a crank puller and an 8mm allen wrench!