Head to head
Parcours AltavsShimano Ultegra WH-R8170 C36
Both sections drawn to one scale, from each maker's published geometry. The differences you can see in the drawing are the differences that exist.
vs
Fig. — rim sections, one scale
Parcours AltaShimano Ultegra WH-R8170 C36
- Depth
- 4 mm apart
- 40 vs 36 mm
- External
- 5 mm apart
- 33 vs 28 mm
- Internal
- 4 mm apart
- 25 vs 21 mm
- Claimed weight
- 2 g apart
- 1,490 vs 1,488 g
- UK RRP
- £301 apart
- £1,099 vs £1,400
Rim depth
40 mm
36 mm
4 mm apart. Deeper is faster on the flat; shallower is calmer in crosswind and lighter uphill. Neither is simply better.
Internal width
25 mm
21 mm
The wider rim is built around a wider tyre. Match this to the tyre you actually run, not to the bigger number.
External width
33 mm
28 mm
Governs how the rim and tyre meet the air, and frame clearance.
Parcours
Alta
RRP £1,099
UCI mass-start road
Eligible — Eligible on the rules we assess
Shimano
Ultegra WH-R8170 C36
RRP £1,400
UCI mass-start road
Eligible — Eligible on the rules we assess