the current chainset is a FSA Gossamer 36/46

I’d like to use this same chainset but put a single ring on it (34t)

where will the new ring bolt onto? the inner ring or the outer?

cheers

On a double there is only one set of holes. I assume you don’t mean “inner or outer RING” but inner or outer position of the SPIDER

Sram compact chainset here: new single ring bolted to inside for a better chainline in the big sprocket and easier to index

yep inner or outer on the spider? Just worried about offsets etc

Inner would be my choice, but you can change it round.

middle will give a better chainline if it clears the chainstays.

It should be in the middle position, but as there isn’t one, inner is *usually* best. Bad chain angles to the small sprocket are usually less painful than bad angles to the large sprocket.

ok great, was worried I’d have to buy the correct one…but it sounds as if there is only 1 and I’ll just experiment to find best chain line.

ok – cheapest? 110? 34t

There’s Raptors at Superstar, both round and oval, for 30 squids.

http://www.superstarcomponents.com/en/cyclocross-io-chainring-narrow-wide-style.htm

19.99 but only in red.

but red is faster

Superstar. Holds fine on my CX bike, which doesn’t have a clutch mech, on stuff that is more rooty than one would ever come across on a ‘cross race. In red

Might throw a chain catcher on too (just in case)trying to make it as fool proof as poss.

….solid tyres? haha

I’ve got a SUperstar 38t on mine with a 105 5701 mech and have only dropped a chain once, including normal trail riding and the 3 Peaks too.

Just get the chain as short as you dare and it won’t come off…………. probably.

Mine is positioned on the inside of the tabs to give better chain line up the cassette.

Mine is positioned on the inside of the tabs to give better chain line up the cassette.

This is also worth bearing in mind if you have a choice of two less-than-perfect chainlines. I generally default to the one that suits the bigger sprockets better, as I’m likely to spend more time in those than in the 11/12T.

Mine’s Absolute Black 38T on the outside of a SRAM Red road crank. I don’t notice any issues with chainline, although I moved all the spockets out one with a HOUP spacer (so really 1×9). Even when running 1×10, I don’t have any issues, but then the largest sprocket is then a 23T.

RD is a BURD, with 25% increased spring tension. The chain stats firmly put!

will I be able to use the same bolts? or will I need shorter?

You will need shorter bolts.

what size?

inner position here. Definitely a better chainline than the outer. You can usually go to a 38 or 40t ring in the inner position before the teeth get too close to the chainstay.

re. bolts – either just get ‘single’ ring bolts or buy some 2mm spacers for your current bolts.

https://www.sjscycles.co.uk/chainsets/12-wheels-manufacturing-chainring-spacer-each/

or just fit a lightweight bash where the current 46 ring is?
http://shop.bbgbashguard.com/products

https://www.sjscycles.co.uk/chainsets/single-chainset-chainring-bolts-pack-of-5/ THESE?

yep. You can see the ‘nut’ part isn’t as deep as a normal (double) one. CRC may have some too.