The ENVE SES 6.7 is 223 g lighter (1,457 g vs 1,680 g claimed per pair); the Mavic COSMIC SL 65 costs €2,174 less (€975 vs €3,149) at our October 2026 price check. The rim depth is 60 mm front / 67 mm rear on the SES 6.7 and 65 mm on the COSMIC SL 65 and the listed tyre range is 25–32 mm on the SES 6.7 and 28–64 mm on the COSMIC SL 65. Both share the internal width (23 mm).
General context for the specifications where these two differ. Numbers in superscript link to the sources below each topic. How much each point matters depends on your riding, tyres and bike.
Weight: what the grams mean
The SES 6.7 is 223 g lighter per pair (1,457 g vs 1,680 g, manufacturer claims).
SES 6.71,457 g
COSMIC SL 651,680 g
On a steady climb only total weight counts: a gram in the wheels costs the same as a gram in the frame or a bottle.1 A common rule of thumb is about 2 seconds per 100 metres of climbing for every kilogram, so 150 g works out at roughly 3 seconds on a 1,000 m climb.2
Rim weight matters somewhat more when you accelerate, because the rim spins as well as moves forward; physically that effect is at most about twice that of frame weight, and only while speeding up.1 Claimed weights are measured differently from brand to brand: some include rim tape and valves, others do not, and tolerances of around ±30 g are common.3 Independent weighing usually lands close to the claim once tape and valves are accounted for.4
Rim depth: 60 mm front / 67 mm rear on the SES 6.7, 65 mm on the COSMIC SL 65.
Cross-sections drawn to scale from the catalogue values for outer width, internal width and depth; hooked rims show the bead hook. Simplified shape, not the manufacturer's exact profile.
Deeper rims generally reduce aerodynamic drag, which pays off most at higher speeds on flat or rolling roads, but they tend to weigh more and can be more affected by gusty crosswinds. In a BikeRadar comparison, 60 mm aero wheels were about a second per kilometre faster on the flat but slower on steep climbs than a considerably lighter set.1
How a wheel behaves in crosswinds depends on the rim shape as well as its depth,3 which is why TOUR measures steering torque in the wind tunnel, not just drag.2 Shallower rims are generally easier to handle in gusts, something lighter riders and riders on exposed roads tend to notice first.1
The SES 6.7 (60 mm front / 67 mm rear) uses different rim depths front and rear.
Some wheelsets use a different rim depth front and rear, and brands disagree on the direction. Roval's Rapide CLX II paired a shallower front with a deeper rear to favour stability.1 The newer Rapide III uses a slightly deeper front than rear, and Roval argues most of the aero benefit comes from the front wheel.2 Zipp's 454 NSW rim itself varies in depth along its circumference.3
Treat a split depth as a design choice of the brand rather than an advantage in itself. If crosswinds concern you, the front rim depth is the figure to look at.
ENVE approves tyres from 25 mm for the SES 6.7 and publishes no maximum. The 32 mm in our catalogue is a Show My Bike assumption, not a manufacturer figure. Mavic approves tyres from 28 mm to 64 mm for the COSMIC SL 65.
SES 6.725–32 mm
COSMIC SL 6528–64 mm
An approved tyre range is the span of tyre widths a manufacturer permits for a rim, based on the ETRTO/ISO tables for tyre and rim combinations.2 Not every brand publishes one: some give a recommendation only, or no maximum. The lower end is the narrowest tyre that fits that internal width safely; the upper end shows how far you can go towards wider, lower-pressure tyres for comfort and grip on rough roads or gravel, provided your frame has the clearance.4
In TOUR's tests, wider tyres at a pressure matched to their width roll about as easily as narrower ones on smooth surfaces and add comfort and grip on real roads, while a tyre much wider than the rim costs some aerodynamic drag.1 Pressure calculators such as Zipp's take the rim's internal width into account as well as the tyre.3
The SES 6.7 uses a hookless rim, the COSMIC SL 65 a hooked rim.
SES 6.7 Hookless: straight wallsCOSMIC SL 65 Hooked: lip grips the bead
Simplified sidewall cross-sections.
A hooked rim has a small lip on each sidewall that grips the tyre bead; a hookless rim has straight inner walls.1 Under the ETRTO/ISO standards, road tyres on hookless rims must not be inflated above 5 bar (72.5 psi),2 there are minimum tyre widths for each rim width, for example 29 mm on a 25 mm internal rim,5 and most wheel makers publish lists of approved tyres.3
Manufacturers cite precision, strength and lower weight for hookless rims; independent coverage describes the weight saving as modest. Hooked rims accept a wider choice of tyres and higher pressures.4 Both work within the standards: check the rim maker's tyre list and the pressure you like to ride before choosing tyres.
How much lighter is the ENVE SES 6.7 than the Mavic COSMIC SL 65?
223 g. The ENVE SES 6.7 has a claimed pair weight of 1,457 g, the Mavic COSMIC SL 65 1,680 g. Both figures are manufacturer claims.
Which has the wider tyre range?
The Mavic COSMIC SL 65. ENVE approves tyres from 25 mm for the SES 6.7 and publishes no maximum. The 32 mm in our catalogue is a Show My Bike assumption, not a manufacturer figure. Mavic approves tyres from 28 mm to 64 mm for the COSMIC SL 65. Check the manufacturer's guidance for your exact tyre and pressure.
What is the price difference between the ENVE SES 6.7 and the Mavic COSMIC SL 65?
€2,174 at our October 2026 price check: the ENVE SES 6.7 cost €3,149 and the Mavic COSMIC SL 65 €975 per pair. Prices change; check the current offer with the retailer or manufacturer.
Which of the two has hookless rims?
The ENVE SES 6.7 uses hookless rims, the Mavic COSMIC SL 65 hooked rims. On hookless rims, use tyres the manufacturer approves for hookless use.
All values come from the Show My Bike catalogue, the same records used on the product pages. Prices checked October 2026. Some model-specific details were reviewed against the manufacturer pages. Manufacturer claims are identified as such. No independent product test is claimed, and no winner is declared.
