On 2018-09-21 13:58, jbeattie wrote:
On Friday, September 21, 2018 at 12:45:50 PM UTC-7, Joerg wrote:
A friend has a vintage Peugeot PX-10, once upon a time nicely
upgraded with Phil Woods axles and BB. He is heavily into MTB,
home-made electric bikes and stuff and I have a hard time
convincing him to fix up his road bike. IOW, the bike doesn't need
much other than new shifter handles, a new freewheel and new tires.
However, he doesn't want to put a lot of effort and money into
that.

The corn cob freewheels don't work in our hilly area for us, ahem,
older guys. What is the largest cog size a PX-10 can take without
installing a new derailer?

My old Shimano 600 was said to max out at 28T but I got it to
easily shift up to 32T by moving the wheel slightly forward in the
dropout slots. AFAIK that isn't possible on a PX-10 because it has
short slots.

-- Regards, Joerg

http://www.analogconsultants.com/

Dude, its Phil Wood hubs and not Phil Woods "axles." Phil would be
spinning in his grave.


Oops. Sorry, Phil, if you can hear me. Though they did make the axles
there, too.


The short answer is that the bike probably has a Simplex Prestige or
LJ derailleur that will handle a 28t cog and maybe larger. You will
have trouble finding a 5sp freewheel with a larger-than-28 cog. Its
more common for 6sp to get into the 30t range.


I've seen them up to 34T though but then the 34T cog was a bail-out
configuration, big step from the next one. That would be ok for my
friend as well.


Having been through this exercise with a PX10, a few points: (1) the
derailleur hanger is French threaded and will not accept a modern
derailleur. The hanger will have to be tapped to 10mm and filed for
a b-adjuster, (2) it has 120mm spacing, and the stays will have to be
spread to accommodate a modern 130mm hub if your pal wants to join
the modern era. That is no big deal for a competent shop. I did
that at home, but I also have dropout alignment tools.


He is a machinist and tool & die maker by trade, has a fully equipped
garage with lathe, mill and so on. He is building stuff for his various
vehicles all the time and made a couple of parts for my MTB so I could
build a sturdy rack.

120mm is a pain though, 10mm is a lot of widening. Looks like this one
can be shortened by grinding off the outer cog:

https://www.ebay.com/itm/Shimano-TZ3...4/322007138705


... (3) Your pal
is hosed when it comes to headsets unless he can find NOS French.
Viola!
https://www.amazon.com/Velo-Orange-T.../dp/B004JKGW9U
He's also stuck with a 22.0mm OD stem, unless he can find NOS or
wants to sand a new stem to 22.0mm. Don't ream the steerer. None of
the bearings are standard size and neither is the DT if he wants to
change his FD. The seatpost is probably 26.4 or some other odd size.
If its the old Simplex seatpost, it also weighs about six pounds. The
French went out of their way to make their bikes incompatible with
the rest of the world.


Yes, I remember that. If it was me I'd probably get a new bike or a used
one from Craigslist. However, such mechanical stuff leaves this guy
completely unfazed. He'll likely have to mod the front a bit as well
because drop bars give him neck pain.


If I had an old PX10, I'd sell it to a collector and get a modern
bike. Skip all the hassles.


Agree. I'd do the same, and maybe he will.

--
Regards, Joerg

http://www.analogconsultants.com/