The chain ring on my standard M3L Brompton is now ridiculously worn. I'm having to file the burrs off the teeth!
But its made as a single piece with the crank so will cost me nearly £60 to replace. I reckon I should really be replacing the ring every 12 months or so. Loads of money.
Now looking at the spares on the SJS Cycles site it looks as though I can buy a spider crank + a chain ring which will cost be a bit more now but save in the long run. I could also rotate it with respect to the crank to spread the wear.
Are they compatible? Will it match the LH crank I have or do I need to replace that as well?