Bontrager Gnarwhal Fat Bike Tyre - 27.5x4.50
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TredzBontrager Black Gnarwhal Tubeless Ready Folding 27.5" Fat Bike Tyre Size 27
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Leisure Lakes BikesBontrager Gnarwhal 27.5x4.50 TLR Studdable Fat Bike Tyre Black
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Bontrager Gnarwhal 27.5x4.50 TLR Studdable Fat Bike Tyre BlackFree delivery in 1–3 days£119.99Visit shop →
Product Information
Full details
The Bontrager Gnarwhal is a high-performance, 4.5-inch wide winter fat bike tyre designed for aggressive riders who need reliable traction on snow, ice, and loose terrain. It is perfect for winter cyclists tackling deep snow or icy paths, offering a stud-ready design and a flexible, lightweight casing. While its wide footprint provides exceptional stability, riders should note that the tyre's aggressive tread is optimized specifically for winter environments and may feel drag-heavy on paved surfaces.
All features
| Model Part Number | 579187 |
|---|---|
| Brand | Bontrager |
Extended Product Information
FAQs
Can I run the Gnarwhal without studs?
Yes, the Gnarwhal performs exceptionally well as a non-studded tyre in deep or loose snow.
How many studs does the 27.5-inch model require?
The 27.5-inch model is designed to accommodate up to 216 studs.
Is this tyre compatible with any fat bike rim?
It is designed for standard fat bike rim widths, but verify your frame's chainstay and fork clearance to ensure it can accommodate the 4.5-inch width.
What is the recommended sealant to use?
Use a tubeless sealant compatible with your rim and tyre combination; check that it is rated for the specific cold-weather temperatures you intend to ride in.
Does the 120 TPI casing make the tyre fragile?
No, the inclusion of Inner Strength casing provides robust sidewall protection despite the supple, lightweight nature of the high TPI construction.
Troubleshooting
Difficulty seating the bead during tubeless setup
Use a blast-charger or compressor to provide an instant high-volume burst of air, and ensure the valve core is removed during the initial seating.
Studs falling out after installation
Ensure studs are pressed completely flush into the designated pockets and allow the tyre to sit for 24 hours before riding to allow the rubber to secure the stud base.
Tyre feels sluggish on groomed trails
Check your air pressure; increasing the PSI slightly can reduce the contact patch on hard-packed snow and lower rolling resistance.
Pros and Cons
Pros
- Excellent traction in deep snow and loose conditions
- Tubeless-ready design reduces the risk of pinch flats
- Stud-compatible for dedicated ice performance
- Lightweight sidewall protection doesn't compromise tyre suppleness
- Wide 4.5-inch profile offers great stability
Cons
- Not intended for high-speed use on hard, clear pavement
- Increased rolling resistance compared to summer tyres
- Requires significant effort to install full set of studs
Setup, Compatibility & Care
The Gnarwhal uses a folding bead design and is fully compatible with tubeless-ready fat bike rims. To set it up tubeless, ensure you are using rim tape compatible with fat bike widths and a high-quality sealant.
If you choose to install studs, use a dedicated stud tool to ensure they are seated flush with the rubber surface. For care, avoid storing the tyres in direct sunlight during the off-season to prevent rubber degradation. Before your first winter ride, check the sealant level inside the tyre, as cold temperatures can sometimes affect the viscosity of standard tubeless sealants.