Head to head
Hunt 34 Aerodynamicist Carbon DiscvsZipp 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
Hunt 34 Aerodynamicist Carbon DiscZipp 303 Firecrest
- Depth
- 6 mm apart
- 34 vs 40 mm
- External
- 2 mm apart
- 28 vs 30 mm
- Internal
- 5 mm apart
- 20 vs 25 mm
- Claimed weight
- 31 g apart
- 1,381 vs 1,350 g
- UK RRP
- £951 apart
- £849 vs £1,800
Rim depth
34 mm
40 mm
6 mm apart. Deeper is faster on the flat; shallower is calmer in crosswind and lighter uphill. Neither is simply better.
Internal width
20 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
28 mm
30 mm
Governs how the rim and tyre meet the air, and frame clearance.
Hunt
34 Aerodynamicist Carbon Disc
RRP £849
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