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ALGI Cotters - I import these directly from the factory in France. They are fully machined from 3/8" (9.5mm) or 9.0mm steel. Both ends are domed to prevent mushrooming when they are installed or removed. The threaded stems are larger, 7mm, and the washers are thicker and harder.
When you compare the moments of inertia for the actual root diameters of rolled 6mm and 7mm threads, you see that the larger threads have twice the resistance to bending. This doesn't mean much in use, but is potentially a big deal when trying to remove them.
There is no comparison between ALGI cotters and those made in Asia. The primary market for Asian cotters is OEM on mass produced bikes that sell for about $30 USD in 3rd world countries. The European market is different, collectors and commuters. People who are willing to spend real money to buy and maintain their commuting bikes. ALGI Equipements is now a large manufacturer and distributor of pneumatic and hydraulic equipment. The great-grandfather of the current CEO started out by manufacturing bike parts in 1923. One was a patented hose with inflation fittings, which lead to their current product line. Today, the bike parts are Legacy products, representing only 2% of their sales and a single page in their catalogs. But they are still manufacturing crank cotters, fishing rod holders and cable clamps.
BTW I think plain 7mm nuts look wrong on a high quality bike. I finally found a US source for M7 Nyloc nuts & I'm enclosing them with every 7mm stem cotter.
Standard Cut ALGI
Cotters, 9.0 or 9.5mm (AKA 3/8") $7/pair
Peugeot cotters are a special case. They are cut so deeply that a 7mm threaded stem will not pass through the gap between the crankarm and the notch in the spindle.
As of 11/12/23 I am out of the Peugeot compatible cotters. I order 800 cotters at a time and still have a good supply of the other types. So I don't expect to get any more for at least a year.
There are a few online vendors that seem to carry them. Search for "ALGI 8.7mm Cotters". 8.7mm does not refer to the diameter, which is 9.0mm.
9.0mm Peugeot Compatible ALGI Cotters $9/pair
Shown here with an original Peugeot cotter.
Not all Peugeots take the "Peugeot Cut" cotters. Some with Nervar cranks take a ¾ cut and they may require some filing to fit. Do the flats on your current cotters extend all the way to the end, like the "Peugeot Cut" cotter shown above?
8.0mm and 8.5mm cotters try Bike
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