A BMC URS gravel frame uses a BB86 press fit (road) bottom bracket shell (41 mm bore, 86.5 mm). The dimensions, which cranks fit, and the exact bottom bracket to buy.
Updated 05 September 2026.
What bottom bracket does a BMC URS gravel use?
The bottom bracket shell standard on a BMC URS gravel, and how to pick the right BB.
| Frame | BMC URS gravel |
|---|---|
| Shell standard | BB86 press fit (road) (41 mm bore, 86.5 mm) |
| Shell inside diameter | 41 mm smooth press-fit bore |
| Shell width | 86.5 mm |
SPINDLE see table
The BMC URS gravel uses a BB86 press fit (road) bottom bracket shell (41 mm bore, 86.5 mm), a 41 mm smooth press-fit bore, 86.5 mm wide.
It is a press-fit shell, so bearings or cups press into the 41 mm smooth press-fit bore. Match the shell width as well as the bore, because a shorter unit will not preload the crank across a wider shell.
SOURCES: BikeRadar, The complete guide to bottom bracket standards · Wheels Manufacturing, BB Overall Width Reference Chart · Park Tool, Bottom Bracket Standards and Terminology
Questions and answers
What bottom bracket does a BMC URS gravel use?
A BMC URS gravel frame uses a BB86 press fit (road) bottom bracket shell (41 mm bore, 86.5 mm).