Up at sparrow-fart to get to the local Royal Mail depot to collect the parcel my missus should have taken in on Thursday if she wasn't out gallivanting. New Stronglight Impact 34/50 chainset for the late 80's/early 90's Holdsworth I picked up for a song 18 months or so ago. The plan was that I'd swap the old Stronglight cranks off my commuter (Bob Jackson frame bought second-hand in ~1980) onto the Holdsworth, fit the new 34/50 chainrings onto the Holdsworth to reduce the climb-crippling ratios of 42/52 on a 7-speed 12-23 cassette, fit the new cranks onto the commuter, fit the old 34/52 chainrings back onto the commuter, in order to keep the ratios I've got used to, and hopefully push the chainset further out so the new front changer (an allegedly 10-speed specific one, used with an 8-speed 13-26 cassette - why would that ever be a problem?) would reliably change down to the smaller chainring - it was on the limit of the adjuster screw, but still occasionally needed assistance from my right heel to change down.
What I hadn't taken into consideration was that the Impact chainrings were 110mm BCD, while the old chainrings were 86mm BCD. For those of a less technical background, this means they were not compatible. Fortunately, I realised this very shortly after I'd removed the left-hand crank from the commuter, but not before I'd almost rounded the flats on the inner part of the crank remover, trying to force it further into the crank, while mistakenly thinking I was applying force to the outer part of the crank remover, which is what I should have been doing to remove the crank. At this juncture, I decided that I should have insisted on staying home and working on the bikes instead of a) going with my missus to the excellent farmer's market in West Bridgford, then trekking round the equally excellent, but excessively numerous charity shops (definition courtesy of Driff Field - POCS; Proliferation Of Charity Shops), and b) starting in on the red wine before the sun was well over the yardarm. The left-hand crank went back on the commuter without a hitch (phew!). The unusual (more later!) chainset came off the Holdsworth, the new one went on with no problem, the pedals were transferred OK, and the gear changers adjusted. Wahey! Next came a change of the old, fear-inducing brakeblocks (did I mention the single-pivot Shimano Dura-Ace brakes? With the original blocks?) for new salmon Kool-Stop Continentals, and a wired Lidl computer.
Anyway, to cut a long and rambling story slightly shorter, the commuter stays as it was, while the Holdsworth has a whole new chainset, a considerably more user-friendly gear range, and an ability both to ascend and descend in a reasonably acceptable manner, while recording average/maximum speed, distance etc.
Oh, and if anyone wants a rather unusual chainset, I have one to offer. It's a Sakae Royal, with 170mm cranks, 42/52 chainrings. The unusual element is that 42 appears to be the minimum size for the inner chainring, as it's a 145 mm BCD. (AFIK the largest commonly available chainrings are 135 for Campag, with a minimum chainring size of 39).