Head to head
Scribe Aero Wide+ 50DvsZipp 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
Scribe Aero Wide+ 50DZipp 303 Firecrest
- Depth
- 10 mm apart
- 50 vs 40 mm
- External
- 1 mm apart
- 29 vs 30 mm
- Internal
- 4 mm apart
- 21 vs 25 mm
- Claimed weight
- 140 g apart
- 1,490 vs 1,350 g
- UK RRP
- £801 apart
- £999 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
21 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
29 mm
30 mm
Governs how the rim and tyre meet the air, and frame clearance.
Scribe
Aero Wide+ 50D
RRP £999
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