Вот инфа из каталога Hoffman Bikes об "Algol sprocket"
ALGOL SPROCKET
The Algol sprocket was designed for the more aggressive rider. Machined 7075 Aluminum gives it the added strength without adding weight.
Spec:
Colors: Black, Bronze, Purple Haze, Red
Machined 7075 Aluminum
5.5mm thick
6 crank position holes
Available Sizes 25t, 27t, 28t only
2.4oz (25t)
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