I’m thinking of converting a 4-bolt 104mm BCD setup to 1x and need a biggish ring, as it’s for mainly road/gravel riding.

Whats the biggest you’ve seen? 36t?

I know Rotor/Hope/Blackspire do a 5-bolt 110BCD in 38/40/42 but I’d prefer to keep the crank as it’s nice and short.

[round or oval]

Raceface and Superstar do a 38T

Superstar Components used to do a 38T iirc.

Ta. Just spotted the 38t RF.

Now then… what about oval?

I’ve got a 38 on the way from Amazon.

Grofitness Aluminum MTB Single Chainring BCD 104mm Round Chainwheel Repair Bicycle Parts (Black, 38T) https://www.amazon.co.uk/dp/B06WGQFVL9/ref=cm_sw_r_cp_apa_RCbqAb2S8NEBS

Doesn’t say it’s narrow wide but the 36 I ordered last week (from the same listing) is.

38 and a 11-23 on my road Cx works really well the 38 is on a 130BCD road crank.

I’ve got a 38t superstar on my CX, I’m sure I’ve seen 40t available somewhere…

Edit: just checked, SS still go up to 38t in 104 BCD, but only seem to do 40 and 42 in 110…

good spot Phil 8)

40 tooth & much cheapness: at CRC

I’ve had 41 tooth in the past, but no idea what make

That’s not narrow wide though Rob

Ive has a 38, 40 and 44 from https://m.ebay.co.uk/itm/MTB-Bike-Aluminum-Narrow-Wide-Chainring-104mmBCD-Single-Speed-Chain-Ring-40T-52T/172963891400?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D2%26asc%3D20171010182013%26meid%3Dc05dd8c1967d4bed8664de62704a060a%26pid%3D100890%26rk%3D1%26rkt%3D12%26sd%3D282427716336&_trksid=p2056116.c100890.m2460

They do up to 52…

That’s not narrow wide though Rob

This is a very good point! In my defence I was quite inebriated.