Head to head
Reserve 40|44vsZipp 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
Reserve 40|44Zipp 303 S
- Depth
- 1 mm apart
- 44 vs 45 mm
- External
- 5 mm apart
- 32 vs 27 mm
- Internal
- 2.5 mm apart
- 25.5 vs 23 mm
- Claimed weight
- 132 g apart
- 1,408 vs 1,540 g
- UK RRP
- £700 apart
- £1,700 vs £1,000
Rim depth
40 / 44 mm
45 mm
3 mm apart. Deeper is faster on the flat; shallower is calmer in crosswind and lighter uphill. Neither is simply better.
Internal width
25.5 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
32 mm
27 mm
Governs how the rim and tyre meet the air, and frame clearance.
Reserve
40|44
RRP £1,700
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