Shimano 46 * 36T, 4 arm chainrings

jds_1981

Hi,

I'm trying to find some cheapish chain rings as above (46, 36 tooth). Seems impossible to the extent it seems worth buying a whole crankset and getting the cranks thrown in for free.. https://www.ribblecycles.co.uk/shimano- ... #pid=19134

Anyone know of any cheap sources?

Also, how do the new bolt/cover things work. Are they required?

Thanks.

The Rookie

What BCD?

48/38 is common for the MTB 4-arm as its Shimano's trecking ratios, that's only a tiny change in ratio from 46/36.

jds_1981

110 bcd

jds_1981

I'm still having no luck finding relatively cheap chainrings.

The cheapest I can find are https://www.acycles.co.uk/specialites-t ... 16597.html
Where 46 tooth is 46.89, but as soon as I select 'external' (no idea what this option does) it goes to £57.89. Is that the going rate now a days?
For the pair I'd like it's about £95
A crank set with the chain rings I'd like can be bought for £137


Anyone have better suggestions?

dinyull

This might not help....but I've found with the newer 4 arm shimano road chainrings your better off buying a new chainset and selling the old/worn on ebay.

As you've seen, chainrings (especially as a pair) are almost as expensive as new chainset.

timothyw

Yeah, my solution to this problem is to avoid the whole new 4-arm 110 bcd standard until either it matures and there is availability of reasonably priced alternative chainrings, or wait for the new 4 arm standard to go away.

With that said, you can get Doval oval chainrings fairly cheaply that are compatible:
http://www.ebay.co.uk/itm/4G-doval-11-7 ... tzMxAcrv4g

Other listings are available.

joncomelately

Might be a bit cheap for you and only gets you half way there but I run a narrow wide chain ring brought from J&L on eBay after a recommendation elsewhere in the forum, and they've served me fine so far (although it took a couple of weeks to turn up). They do a 110mm 46t one but not a 36t one as far as I can see. Don't think it'd matter it's narrow wide?

timothyw

Might be a problem if you want to change gears at the front, on account of narrow-wide chainrings being designed to retain the chain, where normal chainrings have ramps and pins to make shifting easier.

jds_1981

I think the narrow wide might be the way to go. Thanks.
I'll probably get a small chainring to go with it just in case.

joncomelately

TimothyW wrote:

Might be a problem if you want to change gears at the front, on account of narrow-wide chainrings being designed to retain the chain, where normal chainrings have ramps and pins to make shifting easier.

Good shout, hadn't thought of that as I run it on a 1x set up...

jds_1981

Joncomelately wrote:

TimothyW wrote:

Might be a problem if you want to change gears at the front, on account of narrow-wide chainrings being designed to retain the chain, where normal chainrings have ramps and pins to make shifting easier.

Good shout, hadn't thought of that as I run it on a 1x set up...

I don't really ever change out of the 46 at the moment. Infrequently enough at least to assume 1* and wait for the market to mature.

The Rookie

A bit cheaper from ze Germanz
https://www.bike-discount.de/en/shop/ch ... nd-shimano

jds_1981

The Rookie wrote:

A bit cheaper from ze Germanz
https://www.bike-discount.de/en/shop/ch ... nd-shimano

Thanks, I do normally check the Germans too.

Eventually decided to go with the ovals. We'll see...