Road Bike Tire Test: Bontrager Aeolus RSL TLR 28

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  • Bontrager Aeolus RSL TLR 28
Performance compared to all other road bike tires
(100% is best)
Pro Members get 11-point radar charts

Bontrager Aeolus RSL TLR 28 road bike tire on a rolling resistance test machine

The Aeolus RSL TLR is Bontrager's high-end race tire for maximum speed and grip under all conditions. The Aeolus features an RSL TLR construction, which means it includes a 320 TPI tubeless-ready cotton casing combined with a puncture-resistant layer under the tread along with a Race Dual compound for optimal performance.


The puncture-resistant layer indicates that the Aeolus is not a pure time-trial tire but leans more towards an all-round option. In this respect, the Aeolus RSL TLR is comparable to Bontrager's R3 Hard-Case Lite (read our review), but as our test results show, the Aeolus is consistently a step ahead of the R3.


When it comes to tubeless-ready tires with a cotton casing, the current selection is quite limited. From this perspective, the Aeolus RSL is an exciting tire as there is still a large group of cyclists who swear by tires with a cotton casing and will be pleased to have an additional option in this segment.


Bontrager makes the Aeolus RSL available in the most popular sizes: 26-622, 28-622, 30-622, and 32-622. We tested the 28-622 version and will move quickly to the test results.

Manufacturer Specifications


Manufacturer Specifications
Brand Bontrager
Model Aeolus RSL TLR
Year 2024
Tire Type Tubeless
Supplied By Bought in store
New or Used New
Mileage 0 km
Price Range Very High
Buy At
Manufacturer part number 5317704
TPI 320
Compound Race Dual-Compound
Bead Folding
ETRTO 28-622
Size Inch 28"
Specified Width (mm) 28
Specified Weight 285 grams
Max Air Pressure (psi) 95
Made In Members Only
Available Sizes 26-622 (700x26c)
28-622 (700x28c)
30-622 (700x30c)
32-622 (700x32c)

Bontrager Aeolus RSL TLR 28 Test Results

Bontrager Aeolus RSL TLR 28 road bike tire on a rolling resistance test machine

Size, Weight, and Thickness Measurements


Size, Weight and Thickness Measurements
Specified Weight 285 grams
Measured Weight 314 grams
System Adjusted Weight
(tire + valve + rim seal)
334 grams
Measured Width 28 mm (un-round)
Measured Height 24 mm (un-round)
Total Tire Thickness Center 2.5 mm
Total Tire Thickness Sidewall Members Only
Unmounted Casing Width 72 mm
Unmounted Tread Width Members Only
Tread Cover (Tread / Casing Ratio) Members Only
All size measurements are taken at an air pressure of 100 psi / 6.9 bars on a 17.8 mm inner width rim.

Rolling Resistance Test Results


Rolling Resistance Test Results
Inner Tube None (20 ml sealant)
Measured Width 28 mm (un-round)
Rolling Resistance
Real tire width in mm:
22-24 = 132 psi/9.1 bar
25-27 = 120 psi/8.3 bar
28-29 = 108 psi/7.4 bar
Ultra High Air Pressure

(108 psi / 7.4 bar)
9.5 Watts
CRR: 0.00285
Rolling Resistance
Real tire width in mm:
22-24 = 110 psi/7.6bar
25-27 = 100 psi/6.9 bar
28-29 = 90 psi/6.2 bar
Extra High Air Pressure

(90 psi / 6.2 bar)
10.1 Watts
CRR: 0.00303
Rolling Resistance
Real tire width in mm:
22-24 = 88 psi/6.1 bar
25-27 = 80 psi/5.5 bar
28-29 = 72 psi/5.0 bar
High Air Pressure

(72 psi /5.0 bar)
Members Only
Rolling Resistance
Real tire width in mm:
22-24 = 66 psi/4.6 bar
25-27 = 60 psi/4.1 bar
28-29 = 54 psi/3.7 bar
Medium Air Pressure

(54 psi / 3.7 bar)
Members Only
The Road Bike section is a multi tire size section, air pressures have been adjusted to the measured casing width.

All numbers are for a single tire at a speed of 29 km/h / 18 mph and a load of 42.5 kg / 94 lbs.

Use the formula: RR (Watts) = CRR * speed (m/s) * load (N) to calculate rolling resistance at a given speed and load.

Puncture Resistance Test Results

Bontrager Aeolus RSL TLR 28 road bike tire on a rolling resistance test machine
Puncture Resistance Test Results (higher is better)
Total Puncture Score Tread 51 Points
Total Puncture Score Sidewall Members Only
Tread Puncture Force Sharp Needle Members Only
Tread Puncture Force Blunt Needle Members Only
Tread Total Tire Thickness 2.5 mm
Sidewall Puncture Force Sharp Needle Members Only
Sidewall Puncture Force Blunt Needle Members Only
Sidewall Total Tire Thickness Members Only

Static Grip Test Results

Bontrager Aeolus RSL TLR road bike tire on a grip test machine
Static Grip Test Results
Wet Grip Average 77 Points
Wet Grip Center Members Only
Wet Grip Edge Members Only
Grip in points = coefficient of friction * 100
Road bike grip test rim width = 19.0 mm

Conclusion


  • Bontrager Aeolus RSL TLR 28
Performance compared to all other road bike tires
(100% is best)

Pro Members get 11-point radar charts

The Bontrager Aeolus RSL TLR shows exceptional performance in our tests and is currently the top choice when it comes to tubeless-ready tires with a cotton casing. We see very strong all-round performance in both rolling resistance, puncture resistance, and wet grip tests, and we don't find any significant shortcomings besides the somewhat high weight of our sample.


The Aeolus also features an exceptionally wide tread, making this tire particularly suitable for use on very wide rims. The wide tread also provides excellent protection for the sidewalls since the tread of the Aeolus extends all the way to the transition from 1 to 2 layers of the typical cotton casing. We know this is the weak point of other cotton tires that often experience punctures right next to the tread.


The Bontrager Aeolus is a solid choice if you're looking for a tubeless-ready tire with a cotton casing, and at this moment, we recommend it as the first choice in almost all cases.

RATING: 5.0 / 5
TEST VERDICT:
Highly Recommended


Comments



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