Head to head
Fulcrum Speed 42vsZipp 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
Fulcrum Speed 42Zipp 303 Firecrest
- Depth
- 2 mm apart
- 42 vs 40 mm
- External
- 3.5 mm apart
- 26.5 vs 30 mm
- Internal
- 6 mm apart
- 19 vs 25 mm
- Claimed weight
- 35 g apart
- 1,385 vs 1,350 g
- UK RRP
- Level
- £1,800 vs £1,800
Rim depth
42 mm
40 mm
Effectively the same depth — this is not the axis to choose on.
Internal width
19 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
26.5 mm
30 mm
Governs how the rim and tyre meet the air, and frame clearance.
Fulcrum
Speed 42
RRP £1,800
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