Head to head
Black Inc Forty FivevsZipp 303 S
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
Black Inc Forty FiveZipp 303 S
- Depth
- Identical
- 45 vs 45 mm
- External
- 3 mm apart
- 30 vs 27 mm
- Internal
- 0.5 mm apart
- 22.5 vs 23 mm
- Claimed weight
- 155 g apart
- 1,385 vs 1,540 g
- UK RRP
- £1,000 apart
- £2,000 vs £1,000
Rim depth
45 mm
45 mm
Effectively the same depth — this is not the axis to choose on.
Internal width
22.5 mm
23 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
27 mm
Governs how the rim and tyre meet the air, and frame clearance.
Black Inc
Forty Five
RRP £2,000
UCI mass-start road
Eligible — Eligible on the rules we assess
Zipp
303 S
RRP £1,000
UCI mass-start road
Eligible — Eligible on rim height; tyre choice is restricted