chainring replacement

[the_bing]

hi peeps

i'm looking to replace the chainrings on my Campagnolo Mirage crank as i have 52/39 tooth chainrings fitted, and i'd like to fit slightly more uphill-friendly ones (50/34 perhaps?) when i cycle in wales.

my question is are all chainrings a standard fitment (i imagine not) or do i need a specific make?

 

[smokeysmoo]

You don't need a specific make, but you do need to get the right BCD measurement. This is simply the measurement between the chainring bolts, eg: 110 mm
I've just changed the rings on my FSA cranks on the CAAD, they were 110mm.
FYI, bought mine from xxcycle.com, cheaper than anywhere else and delivered within 3 days

 

[guitarpete247]

+1
Have a look at here at Sheldon for more info on BCD

 

[PpPete]

52/39 Campag will likely be 135 mm BCD - so 39 would be the smallest possible ring.
Need to find a suitable compact chainset with cranks that fit your bottom bracket and have a 110 BCD (which it will be if the rings are 50/34)

 

[accountantpete]

You can try a 13-28 cassette on the back if you have not already done so.

 

[the_bing]

ah. great advice guys cheers. i really like my campag crank but my last visit to wales resulted in near death experience grinding up the hills (i have a pathological refusal to get off and push) and this kind of self-harming led me to decide i need to change my front ratios for hill-eating. i'm going to source a full compact crank for ease of swapping

thanks guys!