JonJurnigan

Hello Everyone!

I recently procured a late seventies Peugeot UO-10 that has Rigida 27 x 1-1/4 rims and Continental Sport 1000 tires (32-630). The tires have "Warning: Mount only on hooked type rims" listed on them. I don't think the Rigida rims are hooked. Can anyone confirm this? I haven't inflated the tires to the full listed 120 PSI max (seems very high!) and have ridden a bit at a pressure around 75 PSI. I'm new to road bikes, so any thoughts/experience here would be greatly appreciated!

grumpus

Of the common Rigida alloy rims back then, the narrower Rigida AL-1320 box section rim was hooked, the wider (17 mm internal width?) single wall rim was not hooked IIRC, it maybe had a bit of a ridge. It's easy enough to check, just deflate a tyre and feel the inside of the rim with e.g. a tyre lever to see if it catches on the edge. If not that's okay, you don't need 120 psi in a 32 mm tyre anyway. This SRAM tyre pressure guide is useful, you'll have to fudge it a bit by using 700C instead of 27 inch and tubes (crochet), but it gives reasonable results.

Trakhak

If they're the steel Rigida rims that UO-8's came with for many years, they're definitely not hooked. Even 75 psi would make me nervous.

And, as the previous post pointed out, a pressure calculator might report that 60 or 65 psi would be more appropriate, depending on your weight and road conditions.

zacster

I had a UO8 back in the day and those wheels and brakes would not stop you in the rain.

SurferRosa

Required road bike tire pressure is a function of total bike+rider weight and tire width. Use an online calculator like the Sram one.

JonJurnigan

hey thanks for the tips folks! - i will consult the tire pressure calculator

Andrew R Stewart 

I second the chromed steel Rigida rims lacking a hook edge. And even with their textured brake track had scary little wet weather stopping ability. If this is an issue try to find a leather faced pad (FiberFax IIRC).

As to tire pressure- 70-75psi is what we ran our 27x1 1/4 gum walls back when they were the only choice other than sew ups. Andy

alcjphil

A little story I have about the steel Rigid rims that came on the Peugeot UO8 I bought in 1972. I was sometimes in the habit of filling my tires at the local service station back in the days when they all supplied free air to customers. I went to the station and pumped up my tires, but I noticed that the bike suddenly had a very harsh ride. When I got home after my ride I checked my tire pressure with the truck tire gauge that my grandfather had given me. Result: 130 PSI. Ouch. I quickly reduced pressure and never went to a service station again to inflate my tires. The tires I had were the Michelin 50 27x 1 1/4 that came with the bike. Normally, I was running about 70 PSI in those tires