Hi all,
Thinking of going 1x9 and have the question as per the title.
With a triple chainset you would use the middle ring position for a single ring set up. Would you use the inner or outer chainring position for a double chainset (going to be an FSA K-Force)? Or is it a case of try both and see which appear to give the best chainline across the range of gears?
Many thanks in advance, DanW
I would expect chainstay/chainring clearance to potentially be a little tight in the inner ring position but worth checking
Hadn't thought of that!
I'll be using a small 30T or thereabouts to start with as I need the climbing ability but not so much the top end speed on the tight and twisty trails near me- I think I have the clearance.
After that is is just a case of trying both and judging by eye which chainline looks best?
I use a 36t on the outer position of an XTR M985.
I would use the outer one regardless.
- better clearance
- can you get a 30T chainring that will fit the smaller bolt pattern (if it's actually different)
- better to have more of angle on the chain going to the bigger sprockets on the back than the smaller ones (more teeth for the chain to hang on to and less power applied in bigger sprockets/ smaller gears)
- will work better with a chain guide (roller, slot or bash type) if you use one, which you should
If you're using any spacers on the drive side of the bottom bracket, you could lose one of them and use the outer. It won't make a huge difference, but it'll make you feel better that you've made amendments to compensate!
The crank BCD is 95mm so fits a 29T minimum either in the inner or outer position. No worries there.
Thanks for the extra tips brakes. Having it in the outer position even if the chainline is less ideal looking by eye makes sense.
I have ordered an e-thirteen seat tube mounted chain guide so hopefully this should work smoothly with the ring in the outer position.
Thanks!
You say no worries, but have you actually found a source of 95mm BCD rings?
njee20 there are plenty of custom ww routes such as your chainring and they are actually available aftermarket on CRC/ direct from FSA. FSA do seem to like short term unusual BCD's it has to be said!
Hope the e13 fits okay. It is brilliant but there are only a few mm of sideways adjustment
they are actually available aftermarket on CRC/ direct from FSA
Not as a single ring though surely? It's unique to their doubles, so you'll be able to get a few different ratios, but not that many.
HBC or Experimental Prototype may be the only way to go, don't expect it to be really straightforward.
I always expect anything to do with bikes to be "fun" and "interesting" to sort 😀