65sport

Hello, I've searched threads and hopefully this has not been already discussed. I've looked at all the catalogues. I have a '72 Peugeot PX10 54cm with 700c wheels. I came with no brakes. Can anybody tell me the standard reach these came with? I've seen them for sale in 48-69mm, 49-69mm, and heard of other sizes.

Many Thanks for any and all help.

Paolo

big chainring 

Did they come with MAFAC Racers or Competition brakes? I think the Racer only came in one size. And it was adjustable to meet a wide range of reaches. Same with the Competition until they revamped them in the late 70's.

65sport

Thanks for replying. That's why I'm confused. I've seen the Mafac Racers (Competitions came a little later than '72 I think?) in 48-58mm and also 49-69mm reach.

If I was to guess, I'd say the shorter ones for the PX10 / 700c wheel and the longer ones for a sub PX lower model range 27" wheel. Just a guess. I can always measure mine up with some 700 wheels in my frame. But I hoped someone knew for sure...Wait and see...

rootboy 

The "short" variety should work fine on your Peugeot. BTW, my 71-72 Gitane came stock with Competition model brakes.

Grand Bois

I believe that Peugeot first used the Competitions on the 1974 PX10LE. The PX10E still had Racers that year.

It looks like the Racer was actually produced in three different sizes. https://www.velo-pages.com/main.php?g...geViewsIndex=1

Road Fan

I have a 1968 PX10 53 cm. I can measure the brakes. Have you measured the brake-bolt to rim distance to see what reach you need? The wheel on mine is 700c tubular, but I don't have the original Mavic Montlhery rims.

SvenMN 

Welcome Paolo.

My 1973 to 74 PX-10 came with Competitions. I don't have the bike here right now or I would measure as well. These look to be the shorter reach versions judging by the front.

Grand Bois

My PX10 will take either 700c or 27" wheels with either MAFAC Competitions or standard reach Campy Records.

Frame size and rim brand make no difference.

The brakes on the PX10 above are not original. They're newer than the bike. I don't think it's a '74. If it was a '74, the Reynolds decal would on the down tube.

eschlwc

how do you measure it?

ok, you lock the wheel in the fork/drop, then measure from the middle of the brake bolt straight down (?) to the middle of the rim or ..?

Road Fan

Correct. My motivation was that I think modern tubular rims like Reflexes or the ones on modern aero wheels have a very wide brake track, where the vintage tubular rims were nearly all the same track size and position.

My '60s frame has some significant frame clearance, it would probably take a 630. I'm not sure for the post mid-70s, where the geometry became more upright with more trail, more vertical angles, and (I assume) less clearance. If the UO-8 and similar frames are any example of Peugeot family engineering philosophy, frame geometry was not tweaked significantly, it only saw major changes if any.

Fork and head geometry may affect brake reach.

Road Fan

Several ways. If you have a wheel, measure as you said, from the middle of the brake bolt hole to the middle of the brake track. It might be good to verify what point on the brake track is 622 mm away from the center of the axle, then measure from that rim point to the brake bolt hole center. You'll need a long metric tape or a tape where you can convert from inches with sixteenths to millimeters. The geometry is not really available directly (how do you find the actual center of the axle? It's an approximation), but I think a careful person will only have a millimeter or so of technique error.

Another way is to measure the fork length from the center of the axle to the center of the brake hole on the brake mounting side of the fork, then subtract 622. The remainder should be a pretty close spec on brake reach. This might be the easier approach.

Grand Bois

I'm having trouble wrapping my head around that one.

65sport

Excellent responses, good to see so many knowledgeable and interested PX people here. I also get the feeling the Competitions came later, like '74.

If I can ask, what are the differences between 70's PX. PXE, and PXLE models? Sorry if this has been covered before... Is it a geometry / frame angle thing? Or equipment?

Thanks to all.