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Shimano Disc Brake Adapters - Post Mount to ISO

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These Disc Brake Adapters make it possible to run Shimano 74mm post mount disc calipers on frames and forks with 51mm ISO tabs. Sold individually. Choose either front or rear, and select your rotor size. Hardware included.


  • Front: 74mm to 51mm - 160mm Rotor (F160P/S, Manufacturer part # ISMMAF160PSA)
  • Front: 74mm to 51mm - 180mm Rotor (F180P/S, Manufacturer part # ISMMAF180PSA)
  • Rear: 74mm to 51mm - 160mm Rotor (R160P/S, Manufacturer part # ISMMAR160PSA)
  • Rear: 74mm to 51mm - 180mm Rotor (R180P/S, Manufacturer part # ISMMAR180PSA)

B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.

The product weight specified is an approximate weight based on the manufacturer's specifications (if available) or our measurement of one or two examples. For most products, the weight will typically vary by 5% to 10%.

This product is NOT Eligible for VIP Points.

Weight: 20 grams

Brake Type: Disc 

Front - 74mm to 51mm - 160mm Rotor

Mfg PartNum: ISMMAF160PSA 

Rear - 74mm to 51mm - 160mm Rotor

Mfg PartNum: ISMMAR160PSA 

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*Orders received before 3:00PM Pacific time are shipped the same day (Mon-Sat). Orders over $50
are shipped free (USA only, excluding AK and HI). Some exceptions apply. See Shipping for details. 51


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