39t Chainring - 110mm BCD

[Holdsworth]

I am looking for a 39t chainring to replace the 34t one that adorns my Sunrace chainset. The jump between the 34 and 50 rings is too great and I wan to lessen the gap with the larger inner ring. Must have 110mm BCD (Bolt Circle Diameter) to fit my chainset.

Thanks a lot

 

[gds58]

Try this link to this chainring on ebay. It's a 38 not 39 but for some reason you will not find many 39's for 110BCD. I bought one of these for my Campagnolo compact chainset which was also 50/34 and I found the 34 to be a complete waste of time and far too low geared. These particular chainrings are of nice quality and are very reasonably priced. Should be just what you need!

http://www.ebay.co.uk/itm/120680594...X:IT&_trksid=p3984.m1497.l2649#ht_3032wt_1142

 

[ColinJ]

I bought one of these for my Campagnolo compact chainset which was also 50/34 and I found the 34 to be a complete waste of time and far too low geared.

Sounds like you needed a standard double chainset instead of a compact!

I might use that eBay link myself in the future - thanks.

 

[gds58]

Sounds like you needed a standard double chainset instead of a compact!

Kind of! My bike came with a compact carbon Centaur with the usual 50/34 rings and I didn't want to have to change the whole crankset. I like the 50 ring as opposed to a 52/53 that you might get on a standard chainset, but the 34 was a waste of time so a 38 or 39 made much more sense and the change from big to small and back is much smoother as well. The biggest gear of 50 x 11 is 122.7" in old money which is still bigger than the 119.2" you get from a 53 x 12 but the 50t ring makes it much more 'usable' all the time.

 

[ColinJ]

I can see the sense in that.

I've gone the other way on my Basso. I wanted lower gears so I have a big sprocket and a triple chainset but I don't need a big big ring and a small small sprocket so I use a 14-28 cassette. I don't have the near-redundant 12 & 13 sprockets and instead I get a better choice of bigger sprockets and more opportunity to use the big ring.

 

[Holdsworth]

Try this link to this chainring on ebay. It's a 38 not 39 but for some reason you will not find many 39's for 110BCD. I bought one of these for my Campagnolo compact chainset which was also 50/34 and I found the 34 to be a complete waste of time and far too low geared. These particular chainrings are of nice quality and are very reasonably priced. Should be just what you need!

http://www.ebay.co.uk/itm/120680594...X:IT&_trksid=p3984.m1497.l2649#ht_3032wt_1142

I noticed that Spa Cycles sell 110mm BCD rings but not in the 39t size, they only sell 38 and 40t chainrings for £14 inclusive of postage but not 39t for some reason. Would a single tooth either way affect things much? I was only posting on here to see if anyone had a 39t ring knocking about.

 

[TheDoctor]

A single tooth won't make much difference on a chainring. Personally, I'd go for the 38T rather than the 40T, to give a fractionally lower bottom gear, but there's not that much difference TBH.

 

[simon.r]

Would a single tooth either way affect things much? I was only posting on here to see if anyone had a 39t ring knocking about.

By 2.6%

See http://sheldonbrown.com/gears/

 

[guitarpete247]

SJS sell these at 39T. Just click on the "Select Teeth" drop down arrow.