Head to head
Partington MKII R-Series 39/44vsShimano Dura-Ace WH-R9270 C50
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
Partington MKII R-Series 39/44Shimano Dura-Ace WH-R9270 C50
- Depth
- 6 mm apart
- 44 vs 50 mm
- External
- 2 mm apart
- 30 vs 28 mm
- Internal
- 1 mm apart
- 22 vs 21 mm
- Claimed weight
- 281 g apart
- 1,180 vs 1,461 g
- UK RRP
- £1,800 apart
- £4,200 vs £2,400
Rim depth
39 / 44 mm
50 mm
8 mm apart. Deeper is faster on the flat; shallower is calmer in crosswind and lighter uphill. Neither is simply better.
Internal width
22 mm
21 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
28 mm
Governs how the rim and tyre meet the air, and frame clearance.
Partington
MKII R-Series 39/44
RRP £4,200
UCI mass-start road
Eligible — Eligible on the rules we assess
Shimano
Dura-Ace WH-R9270 C50
RRP £2,400
UCI mass-start road
Eligible — Eligible on the rules we assess