Head to head
Parcours AltavsZipp 303 S
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 AltaZipp 303 S
- Depth
- 5 mm apart
- 40 vs 45 mm
- External
- 6 mm apart
- 33 vs 27 mm
- Internal
- 2 mm apart
- 25 vs 23 mm
- Claimed weight
- 50 g apart
- 1,490 vs 1,540 g
- UK RRP
- £99 apart
- £1,099 vs £1,000
Rim depth
40 mm
45 mm
5 mm apart. Deeper is faster on the flat; shallower is calmer in crosswind and lighter uphill. Neither is simply better.
Internal width
25 mm
23 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
27 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
Zipp
303 S
RRP £1,000
UCI mass-start road
Eligible — Eligible on rim height; tyre choice is restricted