Head to head
Bontrager Aeolus RSL 37vsBontrager Aeolus RSL 51
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
Bontrager Aeolus RSL 37Bontrager Aeolus RSL 51
- Depth
- 14 mm apart
- 37 vs 51 mm
- External
- Identical
- 31 vs 31 mm
- Internal
- Identical
- 23 vs 23 mm
- Claimed weight
- 125 g apart
- 1,325 vs 1,450 g
- UK RRP
- £100 apart
- £2,100 vs £2,200
Rim depth
37 mm
51 mm
14 mm apart. Deeper is faster on the flat; shallower is calmer in crosswind and lighter uphill. Neither is simply better.
Internal width
23 mm
23 mm
Identical — both suit the same tyre widths.
External width
31 mm
31 mm
Governs how the rim and tyre meet the air, and frame clearance.
Bontrager
Aeolus RSL 37
RRP £2,100
UCI mass-start road
Eligible — Eligible on the rules we assess
Bontrager
Aeolus RSL 51
RRP £2,200
UCI mass-start road
Eligible — Eligible on the rules we assess