Head to head
Cadex 50 Ultra 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
Cadex 50 Ultra DiscZipp 303 Firecrest
- Depth
- 10 mm apart
- 50 vs 40 mm
- External
- Identical
- 30 vs 30 mm
- Internal
- 2.6000000000000014 mm apart
- 22.4 vs 25 mm
- Claimed weight
- 1 g apart
- 1,349 vs 1,350 g
- UK RRP
- £800 apart
- £2,600 vs £1,800
Rim depth
50 mm
40 mm
10 mm apart. Deeper is faster on the flat; shallower is calmer in crosswind and lighter uphill. Neither is simply better.
Internal width
22.4 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
30 mm
30 mm
Governs how the rim and tyre meet the air, and frame clearance.
Cadex
50 Ultra Disc
RRP £2,600
UCI mass-start road
Eligible — Eligible on rim height; tyre choice is restricted
Zipp
303 Firecrest
RRP £1,800
UCI mass-start road
Eligible — Eligible on rim height; tyre choice is restricted