Head to head
Reserve 40|44vsZipp 303 Firecrest
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 Firecrest
- Depth
- 4 mm apart
- 44 vs 40 mm
- External
- 2 mm apart
- 32 vs 30 mm
- Internal
- 0.5 mm apart
- 25.5 vs 25 mm
- Claimed weight
- 58 g apart
- 1,408 vs 1,350 g
- UK RRP
- £100 apart
- £1,700 vs £1,800
Rim depth
40 / 44 mm
40 mm
Effectively the same depth — this is not the axis to choose on.
Internal width
25.5 mm
25 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
30 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 Firecrest
RRP £1,800
UCI mass-start road
Eligible — Eligible on rim height; tyre choice is restricted