Head to head
Princeton CarbonWorks Grit 4540vsZipp 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
Princeton CarbonWorks Grit 4540Zipp 303 Firecrest
- Depth
- 5 mm apart
- 45 vs 40 mm
- External
- 2 mm apart
- 32 vs 30 mm
- Internal
- Identical
- 25 vs 25 mm
- Claimed weight
- 170 g apart
- 1,520 vs 1,350 g
- UK RRP
- £800 apart
- £2,600 vs £1,800
Rim depth
40 / 45 mm
40 mm
3 mm apart. Deeper is faster on the flat; shallower is calmer in crosswind and lighter uphill. Neither is simply better.
Internal width
25 mm
25 mm
Identical — both suit the same tyre widths.
External width
32 mm
30 mm
Governs how the rim and tyre meet the air, and frame clearance.
Princeton CarbonWorks
Grit 4540
RRP £2,600
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