Hi everyone,
I don't normally post on Reddit and am not used to it, so tell me if I've posted in the wrong place. (I know my bike needs a clean, it's been taken through the mud)
TLDR: I need to know what type of SRAM X sync chainring I need, I'm wanting to change from a 44t to something like a 34t
I have a boardman Cx team (2016 I believe)
Here are photos of the chainring, wasn't sure what you needed to see so feel free to ask for more specific ones
I'm not sure what offset chainring is required.
So far I think I need a SRAM X-sync 1, 11 speed, direct mount. Other than that I can't figure out if it it's boost, and what offset in mm or degrees
I'd really appreciated any help given
Hope you all have a nice day,
Cheers.
by Dangerous-Virus-9097
5 Comments
https://preview.redd.it/iqldnnpb758f1.png?width=1080&format=png&auto=webp&s=e2c506991b6d5baaddfeb502095f2efc2ee19eee
Here is the model, if that helps
that’s a 5-bolt crankset, which is pretty typical. You’ll want to figure out what the BCD (bolt-circle diameter) is for the crank/chainring. It should be printed somewhere on the chainring and/or crankset. It’s likely 110bcd.
There are a bunch of brands with compatible chainrings, designed for 1x drivetrains. SRAM calls this “X-Sync”. I like Wolf Tooth’s options, they call their 1x chainrings “drop stop”
It’s not direct mount, so offset doesn’t apply. You need to [calculate the BCD](https://www.wolftoothcomponents.com/pages/how-to-measure-bolt-circle-diameter-bcd), and buy a 5-hole narrow-wide chainring with the desired number of teeth that shares that BCD.
I’m guessing the BCD is 110, but be sure to confirm this. [Wolf Tooth](https://www.wolftoothcomponents.com/products/110-bcd-cyclocross-chainrings) makes one in 34T.
Understand that you’re talking about a HUGE reduction in the number of teeth, and you will need to shorten the chain quite a bit. All of your gears will be much lower than before.
Looks like 5×110 bolt circle diameter to me.
Measure the distance between bolts, and compare [here](https://www.wolftoothcomponents.com/pages/how-to-measure-bolt-circle-diameter-bcd)
Hi you don’t want direct mount, you want 5 bolt design. I think that they only go down to 40t for that crank for a 1x narrow wide chainring. Maybe something from another manufacturer with the same bcd (bolt circle diameter) would work. Offset wouldn’t be too critical I would have thought as it would only be a couple of mm either way and you’re not shifting rings on the front.