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I think I sold all mine, but will take a look…

Probably clutching at straws, but are they 6- or 7-speed-era Biopace? There's a small possibility the chain is too narrow for the rings…

'Modern' (or correctly oriented) oval rings, in scientific terms, seek to maximise the integral of the product of your instantaneous leg power and the mechanical advantage produced by the chainring. Given that your legs cannot produce constant power during a pedal cycle, a round chainring is not...

And it's also remarkably easy to do…

What cassette did you fit in the end? You can usually 'overshift' SunTour 7-speed shifters to give you a 'friction' eighth speed on the largest cog, the position of which is determined by the end-stop screw on the rear mech. However, SunTour cog spacing is awkward, because it's 'normal'...

Could it be due to chainring wear, as opposed to their particular shape?

Did you get sorted / do you want me to look when I go garage diving?

You probably won't run into this problem de facto, but you know there are variations on the 1" headset right? 1990: 1991: 1992/3:

Kind of vaguely interested in the 17" Rocky Mountain Experience frame for sh!ts and giggles… * Any suspension correction / how many mm travel? I'm guessing a whole 50mm from the '92 catalogue? * Headtube length? * Approximate packing and shipping cost to the UK?

I'll ask to take photos of the frame when I go in to check the price on the forks 😁

Powder-coated finish 👍🏻

I'm not 100% sure what you're asking, but they appear to have no bulge in the crown. The steerer length is ~192mm.

@tangent has PM. The Orange Clockwork is 19" C-T and a ~22.5" top tube. They want around £150 for it but I need to confirm that.

Swapping your thumbshifters over and putting them under the bars has been around since at least 1990 😁 I used to love the SunTour wishbone shifters which basically took this design and did it properly. However, they're not great for gnarlier riding as they can basically get in the way of you...

Saw a very similar Peugeot in the window of the shop I bought the Laiti Mono from in Montpellier...

Okay, sounds like I need to go back and take photos and measure the steerer... If I'm brokering, @tangent has first dibs based on message timing.

PS: Also a nice Orange Clockwork frame that they'd fit 😁

Bristol Bike Workshop have a pair of 1" threaded Pace RC30s in at the moment… I think they were asking £130 for them. They're at 88 Colston St, Bristol, 0117 926 8961.

If it was just the plastic cover, I don't believe the reflection of the phone in this photo would be so narrow…

Those are different castings, though, no? One appears to have a much more float top, the other has rounded edges…?