Thirteen named brakes, and both dimensions published
SHIMANO BR-CT91 shoes, 50 × 16 mm (1.97 × 0.63 in), pair
A pair of Shimano BR-CT91 cantilever brake shoes, 50 by 16 mm (0.63 in), naming the thirteen Shimano brakes they fit.
What you are getting
A pair of Shimano BR-CT91 cantilever shoes: 50 mm (1.97 in) long, 16 mm (0.63 in) wide, 30 g (1.1 oz) a piece, rubber and steel, for aluminum rims — and a list of thirteen brakes they fit. $9.20.
It names thirteen compatible brakes, which nothing else here does
“Suitable for: BR-CT90-E, BR-CT90, BR-CT5.0, BR-CT51, BR-CT20, BR-CT21, BR-TY20, BR-TY21, BR-TY22, BR-TY23, BR-MJ05-E, BR-MJ05, BR-MJ10.”
The introduction to this shelf makes the point that pads “are cut to a specific caliper family and are not interchangeable”. This is the only listing in the American survey for this shelf that answers that by name rather than by category — and two of the thirteen carry the -E suffix, which is Shimano’s e-bike designation.
If your brake is on that list, the fitment question is settled. If it is not, measure.
It publishes both dimensions, which only this one does
50 mm long and 16 mm wide. Every other rim shoe in this group gives a length and stops: the Chooee 55 mm, the M65T 60 mm, the CNC set 55 and 70 mm.
Width matters as much as length on a narrow rim. A 16 mm (0.63 in) pad on a 19 mm (0.75 in)-wide braking surface fits with margin; on a narrow road rim it would overhang the edge, which is the one place a pad must not touch.
Thirty grams a piece, and the arithmetic that follows
Sixty grams a pair — the heaviest rim shoe in this group, against 48 g (1.7 oz) for the M65T and 41 g (1.4 oz) for the R55C3 cartridge.
That is not a drawback. On a brake shoe, mass above the backing plate is compound, and compound is what wears away before the wear limit is reached. A heavier shoe at the same dimensions has more of it.
Rubber and steel, named as two materials
“Material: rubber, steel.” The steel is the post and the backing; the rubber is the friction material. Naming both is more than the CNC listing’s “durable rubber and aluminum alloy” — aluminum being a softer backing than steel — and far more than the Kool Stop listing, which names no material at all.
And the bullets are in German, on an English listing
“Bremsklötze. Schwarz. Material: Andere. Unisex. Erwachsene.”
Five bullets, in German, and the third one says “material: other” — contradicting the description field, which says rubber and steel. The real specification sheet is in the description, and it is a good one.
That is worth stating plainly: on this listing, ignore the bullets and read the description. The same is true of the R55C3 cartridge shoes on this page, whose description is in Spanish.
What is not published
No compound name, no wear-limit figure, no post type — a cantilever shoe may be smooth or threaded, and this says neither — and no wet/dry claim, which the M65T on this page does make.
Availability
Read on the day this page was built: $9 at the American Amazon shop.
Read from Keepa on the day this page was last revised; stock and price both move without notice.
Prices quoted in this text were read on 2026-10-06. The live price is at the top of the page.
