Largest Cog for Simplex Criterium?
07-26-24 | 06:31 AM
#1
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From: Los Angeles
Bikes: 82 Medici, 85 Ironman, 2011 Richard Sachs
Largest Cog for Simplex Criterium?
Notice, I did not say maximum. I want reliable shifts for a single chainring Cyclocross bike with 5 cogs. I’ve got a 14-22 on it now but when I go to the co-op, I need some rummage criteria. The bike is a 1973 PA-10E
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I don't do: disks, tubeless, e-shifting, or bead head nymphs. But I do hate all e-bikes.
I don't do: disks, tubeless, e-shifting, or bead head nymphs. But I do hate all e-bikes.
07-26-24 | 07:03 AM
#2
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From: Middle Earth (aka IA)
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Velobase has it listed at a max cog of 34 and a chain wrap of 34.
https://www.velobase.com/ViewCompone...5-f5438c4ba4fd
I have a later simplex derailleur on my Peugeot PXN 10 (a Simplex SX 410) and it handles a max cog of 28 teeth and a chain wrap of 30 nicely.
https://www.velobase.com/ViewCompone...5-f5438c4ba4fd
I have a later simplex derailleur on my Peugeot PXN 10 (a Simplex SX 410) and it handles a max cog of 28 teeth and a chain wrap of 30 nicely.
Last edited by bikemig; 07-26-24 at 09:42 AM.
07-26-24 | 07:25 AM
#3
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From: WNY
It all depends on the cage that is fitted to the parallelogram body, particularly the distance between the lower pivot mount and the upper pulley axle-bolt. Every Criterium I have seen uses the "CP" cage. The "T" cage has the pivot mount closer to the upper pulley axle than the more race-oriented "CP"cage. There is also the GT, which is obviously longer than either of these two cages.
In this photo, the T cage is on the left, CP on the right. I recently replaced the CP cage on a Criterium with a GT cage from a SX-810 that was probably 10 years newer, but same threads!
Here is the Simplex model number de-coder chart. The type of cage isn't stamped on the body, so you need to visually differentiate them based on the pivot mount location and cage length.
Lots of catalogs here:
https://labibleduvelocataloguessimplex.blogspot.com/
In this photo, the T cage is on the left, CP on the right. I recently replaced the CP cage on a Criterium with a GT cage from a SX-810 that was probably 10 years newer, but same threads!
Here is the Simplex model number de-coder chart. The type of cage isn't stamped on the body, so you need to visually differentiate them based on the pivot mount location and cage length.
Lots of catalogs here:
https://labibleduvelocataloguessimplex.blogspot.com/
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72 Fuji Finest 72+76 Super Course, 72 Gitane Tour de France, 74 P-10 & 79 Tandem Paramounts, 76 Grand Jubile,84 Raleigh Alyeska, 84 Voyageur SP, 85 Miyata Sport 10 mixte 89 Cannondale ST400 and a queue
72 Fuji Finest 72+76 Super Course, 72 Gitane Tour de France, 74 P-10 & 79 Tandem Paramounts, 76 Grand Jubile,84 Raleigh Alyeska, 84 Voyageur SP, 85 Miyata Sport 10 mixte 89 Cannondale ST400 and a queue
Last edited by Schreck83; 07-26-24 at 11:52 AM. Reason: spellin. corrected the cage found on the Criterium to CP
07-26-24 | 11:26 AM
#4
feros ferio
Joined: Jul 2000
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From: www.ci.encinitas.ca.us
Bikes: 1959 Capo Modell Campagnolo; 1960 Capo Sieger (2); 1962 Carlton Franco Suisse; 1970 Peugeot UO-8; 1982 Bianchi Campione d'Italia; 1988 Schwinn Project KOM-10;
When I worked at a Peugeot/Nishiki dealership in the early 1970s, most customers wanted a lower bottom gear on their P*-10, all of which came back then with 14-15-17-19-21 freewheels. Standard procedure was to replace the freewheel with a 14-28. The best solution was also to replace the 45T inner ring with a 40, since 52-40 / 14-17-20-24-28 makes a superb 1.5-step ratio progression and was standard on most of the UO-8s and AO-8s of that era, although we also saw some 52-36 / 14-26 and other combos on them. The stock Simplex derailleurs had no trouble handling 28T in back.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
07-29-24 | 07:32 PM
#6
feros ferio
Joined: Jul 2000
Posts: 22,410
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From: www.ci.encinitas.ca.us
Bikes: 1959 Capo Modell Campagnolo; 1960 Capo Sieger (2); 1962 Carlton Franco Suisse; 1970 Peugeot UO-8; 1982 Bianchi Campione d'Italia; 1988 Schwinn Project KOM-10;
That matches my own early 1970s experience with both statistics and both derailleurs.
__________________
"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
07-29-24 | 07:39 PM
#7
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From: Alta California
07-30-24 | 05:33 PM
#8
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From: Northern California
Bikes: Cheltenham-Pedersen racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.
Using the spring tension adjuster at the cage pivot, one can alter the balance of spring pre-load on the A (cage) and B (mounting bolt) pivots, to better preserve radial distance from the rear wheel axle to the guide (top) pulley.
I've done this, but in the opposite direction, to move the top pulley closer to a 24t big cog, for more-responsive shifting action (pictured below).
I am recalling that turning the pivot bolt with a 5mm Allen wrench at first seemed counter-intuitive as far as the turning direction, before re-tightening the locking hex nut on the cage plate with a (12mm?) open-end wrench. But really couldn't have been much easier.
I've done this, but in the opposite direction, to move the top pulley closer to a 24t big cog, for more-responsive shifting action (pictured below).
I am recalling that turning the pivot bolt with a 5mm Allen wrench at first seemed counter-intuitive as far as the turning direction, before re-tightening the locking hex nut on the cage plate with a (12mm?) open-end wrench. But really couldn't have been much easier.
07-31-24 | 06:52 AM
#9
Senior Member
Joined: Feb 2013
Posts: 15,369
Likes: 4,393
From: Alta California
Using the spring tension adjuster at the cage pivot, one can alter the balance of spring pre-load on the A (cage) and B (mounting bolt) pivots, to better preserve radial distance from the rear wheel axle to the guide (top) pulley.
I've done this, but in the opposite direction, to move the top pulley closer to a 24t big cog, for more-responsive shifting action (pictured below).
I am recalling that turning the pivot bolt with a 5mm Allen wrench at first seemed counter-intuitive as far as the turning direction, before re-tightening the locking hex nut on the cage plate with a (12mm?) open-end wrench. But really couldn't have been much easier.
I've done this, but in the opposite direction, to move the top pulley closer to a 24t big cog, for more-responsive shifting action (pictured below).
I am recalling that turning the pivot bolt with a 5mm Allen wrench at first seemed counter-intuitive as far as the turning direction, before re-tightening the locking hex nut on the cage plate with a (12mm?) open-end wrench. But really couldn't have been much easier.
Wonderful job finding those pulleys which so perfectly match the Clubman's paint finish!
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