nardo1221

I have searched quite a bit for an answer regarding my shift bosses and have had no luck... even my lbs couldn't really help me out. If this has been addressed already, my apologies... a push in the right direction would help... if not, any advice is appreciated.

I have an ~ '82 Peugeot PH10 with fully round shift bosses. They have a square base but are not squared off / keyed at the outer end (https://imgur.com/cW45coj). The bicycle was gifted to me with Shimano RX100 downtube shifters mounted (which worked but are very damaged and need replacing) but I am quite confident that the original shifters were simplex (not sure which type though). So they should have worked with some type of simplex kit and it seems I can retro fit with shimano but it would seem most all shifters require that squared end to fit properly... What are my choices? I wanted to use the silver shifters from rivendell bicycles but they will not work. It's a six speed and I wanted to keep it friction shifting. Should I just find another set of shimano? Why are these bosses so uncommon/ why has it been so difficult finding information about them?

Any help is appreciated, Thanks
B.

FBinNY 

Take a gander at the stop plate on the opposite side (why didn't you photograph that side?). I believe it should have some sort of tab or slot somewhere alone the edge. The lever's top plate has a tab that comes around the lever and engages that so it can't rotate.

A number of levers used that system, insteds of the side flats of the Campy Record version, including Campagnolo Valentino, Huret, and Simplex.

Here's a photo showing the concept, note the tab on the bottom. However compatibility depends on the various dimensional points of fit. Given Peugeot's long term realtionship with Simplex, that's where I'd start.

onespeedbiker

I believe the non-notched downtube bosses are for some vintage French. It's the same on my 85 Peugeot PH 105 and it uses Sachs Huret shifters. I checked 1982 PX10 and it came with Simplex derailleurs/ shifters but Simplex switched to the standard notched bosses in 1974. But Peugeot also used Hurets shifters that use the non-notched bosses.

nardo1221

That stop washer came with the silver rivendell shifters. It fits over the square base of the boss (albeit not without a little filing first here). The other side looks exactly the same as the right shown in the photo. To my knowledge this stop washer serves a different purpose than the notches at the end the main barrel. The stop washer at the base limits the motion of the shift arm while the barrel notches lock the outermost keyed washer so the screw tightens against a non rotating part. You need both in some respect for the shifter to work. I can pad out the rivendell shifters with an extra washer and it will still catch the stop washer but the screw unloosens after a few shifts because the outer keyed washer is rotating with the shifter.

So I need a shifter than fastens in such a way that the notches are not necessary... Like I said the shimano shifters mounted had worked but I couldn't tell exactly how they were mounted. Isn't there a sticky somewhere showing different shifter bosses of the past 30-40 years and compatible shifter sets? I could find any discussion of shift boss compatibility on Sheldon Brown either...

Do you think my local bike builder could possibly shave these bosses in place or would the bosses need to be replaced?

FBinNY 

I, earlier, linked to a photo showing how on bikes like yours the top plate is keyed to the back plate via an external tab. If you get levers of this design which is what the bike originally used, you're home free without modification.

Otherwise, someone with some hand skill can file the flats onto you bosses to accept the side flatted top washer of the Campy system. However this is a delicate job because the fit has to be very precise so the keyed washer cannot rotate. Otherwise the washer will walk back and forth as you use the lever working the retaining screw loose pretty fast.

You might also help yourself by using a non-locking thread retainer like vibra-tite on the screw to make it resist working loose, yet still be adjustable.

SBinNYC

Here's a link to a better diagram showing how the stop is supposed to work.

https://www.velo-pages.com/main.php?g...serialNumber=2

The stop, Ref. 2694, hits the notch on the lever, Ref. 2948, on the right side. The left side is similar with stop, Ref. 2695, stopping lever, Ref. 2949. They are designed to work with both the clip or the braze-on, Ref 599.

nardo1221

My apologies, I misread your post. I totally understand the concept now and stumbled upon a few more photos which give a good sense for the way it works... seems far more complicated than notching the main barrel. Anyhow I live near a reputable bicycle builder; I'll ask whether they could file the bosses to accept my riv bike shifters. In the meantime I will search for the appropriate shifter. Thanks very much for the help.

garrett77

Hello. I have recently acquired a frame with the same type of boss. I am interested in filing the flats. I am curious what you chose to do with your frame. Thanks.