Replace chain rings or new chain set?

[Sweep]

Thanks for your honest reply cycle tramp- yes I rather think you maybe have confused me more

Happy that you recognise the, er, "wisdom" of stupid questions though.

I take it that I should stop worrying for my particular issue and just get this:

http://www.chainreactioncycles.com/Mode ... elID=47288

[Sweep]

I should add that I definitely need 130 BCD

[cycle tramp]

Thanks for your honest reply cycle tramp- yes I rather think you maybe have confused me more

Happy that you recognise the, er, "wisdom" of stupid questions though.

I take it that I should stop worrying for my particular issue and just get this:

http://www.chainreactioncycles.com/Mode ... elID=47288

ooh, nice chain ring. Hope you don't mind me asking, but how many teeth does your old chain ring have?

[Sweep]

oo, personal question

53

Single chainring married to a 3-speed SRAM dual drive and a 7-speed 12-32 cassette so 21 speeds in all, a nice range.

[cycle tramp]

well, i can't see a problem, both your old chain ring and then new one share the same BCD and the same number of teeth.. unless anyone on the forum knows any different...
(although if your old one was only being used as a single chain ring, i guess you may just be able to turn it around (so the chain will wear the teeth wear the teeth on the non-worn side) if you wanted to save a bit of money.. (unless, of course, the old chain ring had a little pin mounted to it, to stop the chain falling between the crank and the chain ring, in the event that the chain came off)

[Sweep]

Can you explain this please?

I'm maybe being thick (actually very probably) but I don't understand how the teeth will just be worn on a single side.

[Brucey]

they usually are worn just on one side, where the load is transferred between chain and tooth, (which is a tangential loading). If you measure carefully the root of each tooth will typically be very slightly worn and the back of each tooth (i.e. facing CCW when viewed from the right side of the bike) may be so unworn that it still has the original colour to it.

Wear at the root of each tooth doesn't really matter much IMHO; some chainring designs even cut this part away to provide mud clearance etc.

cheers

[Sweep]

thanks Brucey and cycletramp - I may try this on the Speed Pro - am wary of buying new bits for it in advance of total need as the thing is so tempermental it could just give up the ghost one day and leave me with a supply of virgin oddball bits.