Ah, good, well I measured it and it's 126, but out of curiosity pulled the rear wheel of a former housemate's semi-derilict Trek 1000, measured his, it's 130cm, and had a go putting his wheel on my bike. It really didn't take much effort to get the wheel to go on and it spun fine. So that's quite good news. I may pick up a pair of Tiagra wheels or see if I can track town a good price on just a rear Aksium wheel. Where can I find these spacers?
Tragically I got dirty chain grease all over one of my fairly-nice shirts.
Suggestions?
I also noticed that my Reynolds531 steel Peugeot isn't really much heavier than the aluminium Trek 1000.
How likely am I to be able to get the 7-speed cassette w/ spacer to line up just where the old wheel did such that I can swap the two back and forth at will (such that I could use the old wheel for commuting and the new one for proper rides)?