My Merc GT3 is 1020mm. They also used the early finer rear wheel spokes. I had to replace four after a rough camping trip carrying luggage. Broke one spoke and had to carry on until I got back. Fixed that one, but three more went shortly afterwards - must have strained them badly because the wheeel was clicking horribly every turn for about forty miles before I could deal with the knackered spoke.



I'm just arranging to buy a Steve Parry front Mech bracket and a campag mirage mech. I bought a smaller 42 tooth front chainring from Merc for - wait for it £4.50! It's a really nice bit of alloy machining and I fitted it along side the old 53 tooth ring. It does just what I wanted, lowering the gearing, but with the attendant disadvantage of lowering the top end too when I'm whizzing along on the flat with a tailwind and my legs are spinning like a circus act. Also of course, to change, I need to get filthy and stop and fiddle with it, which is why I'm considering the front changer.

I didn't need to alter the chain length or anything - it works fine so far.

Has anyone fitted a front changer like this? Parry's clamp deals with the slightly odd arrangement on the Brompton of the seat tube and the bottom bracket not being directly underneath.