Panaracer Gravel And Cyclocross Tyres

Nailing Your Tubeless Setup: Compatibility and Standards

Not every GravelKing carries the TLC badge, so it's worth knowing what to look for before you buy. As a rule, only models 32c and wider are tubeless compatible - check the sidewall for the TLC logo rather than relying on product listings alone. The AX-Alpha Cord casing used across the GravelKing range is an ultra-fine, high-density weave that gives the tyre a supple, responsive feel, but it does mean the casing can weep sealant for the first few rides while it beds in. That's normal - just top up and ride.

Internal rim width matters more than most riders account for. For 38c and wider tyres, an internal width of 21 - 25mm is the practical sweet zone; go narrower and you lose the tread profile the designers intended, go wider and the sidewalls flare in ways that can affect handling predictability. If you're running hookless rims - increasingly common on gravel-specific wheelsets - check the maximum pressure rating carefully. Most hookless setups cap at 60psi (roughly 4 bar), which is fine for gravel use but worth confirming against your rim manufacturer's guidance before you inflate.

Thinking about a 650b conversion on a 700c frame? Tyre clearance is the gating factor. A 650b x 47c often fits where a 700c x 38c is already tight, giving you more volume and compliance, but measure your frame's clearance - mud and debris need room too. Panaracer's rim tape and valve extenders are worth picking up at the same time if you're setting up tubeless from scratch, particularly on deep-section rims where a standard valve won't reach.

Breaking Down the GravelKing Range

The GravelKing lineup is broader than it first appears, and each variant has a distinct purpose. Getting the wrong one for your riding is an easy mistake - and an expensive one if you're ordering online without handling the tyre first.

The GravelKing Slick is the road-biased end of the family: minimal tread, low rolling resistance, and best suited to tarmac or firmly compacted gravel paths where you want speed above all else. Step up to the GravelKing SS (Semi-Slick) and you get a file-tread centre strip with side lugs - fast rolling on hardpack, with enough bite to give you confidence when the path surface changes or you clip a wet grass verge. This is the one many UK riders reach for through late spring and summer.

The GravelKing SK (Small Knob) is where the range earns its off-road credibility. Block tread across the full width of the tyre grips loose gravel and light mud effectively, and the ZSG Natural Compound's durability means the knobs hold their shape over a full season's riding rather than rounding off after a few months. This is a genuinely versatile tyre - useful across conditions that shift between loose stone and damp lane - and it's the model that often comes recommended when riders ask which single GravelKing to own.

For UK winters, the GravelKing EXT (Extreme) is the answer. Widely spaced, aggressive knobs clear thick mud rather than packing it in, and the tread pattern gives you something to work with on slippery wet roots and the kind of sloppy field crossings that make cyclocross riders question their life choices. If you're comparing options, Maxxis gravel tyres and WTB gravel tyres also compete in this space, but the EXT's balance of mud clearance and rolling efficiency on firmer sections gives it a clear identity.

The newer GravelKing X1 sits above the EXT in terms of aggression - a full mud tyre in everything but name, aimed at wet CX conditions or particularly brutal winter gravel routes. It's a niche choice, but relevant if your local riding involves extended sections of soft ground.

On casing, the standard version is the lightest option, but the Plus and ProTite variants add meaningful reinforcement. The Anti-Flat Casing in these models runs bead-to-bead, protecting against the sidewall slashes that are almost inevitable on flinty chalk routes like sections of the South Downs. The weight penalty is real - expect roughly 50 - 80g more per tyre - but that trade-off is straightforward if your local riding involves anything resembling the North or South Downs, the Chilterns, or the Yorkshire Wolds. Vittoria gravel tyres and Continental gravel tyres offer comparable protection-focused options if you want to compare approaches. If you race CX on glued tubulars rather than clinchers or tubeless, our Panaracer tubulars page covers that side of the range separately.

Surviving UK Conditions: Flint, Mud, and Sealant Care

The Anti-Flat Casing is your first line of defence on aggressive UK surfaces, but tubeless sealant is the second. Use a quality latex sealant - Panaracer's own tubeless sealant is a logical choice - and don't skimp on the volume. A 38c tyre on a gravel bike needs more sealant than a road tyre, typically 50 - 60ml, and in UK conditions you should plan to top it up every three to four months. Wet weather riding and frequent bike washing accelerate sealant degradation, and a dry tyre is far more vulnerable to puncturing on flint than one with a fresh charge of latex inside.

The AX-Alpha Cord casing's fine, high-density weave is part of what makes GravelKings feel so compliant under load - it flexes and conforms rather than transmitting every sharp edge directly to your hands. That suppleness is a genuine ride quality asset, particularly over long days. The flip side is that a fresh installation can seep sealant through the casing for the first few rides. Don't panic. Inflate to pressure, spin the wheel to coat the inside, and ride it. It usually seals itself within twenty minutes of riding, but if you're still seeing weepage after a couple of outings, check that your rim tape is seated cleanly across every spoke hole with no lifting edges - that's where the majority of slow leaks originate.

For winter mud specifically, clearance between the tyre and frame matters as much as the tread pattern. A tyre that packs mud into the fork crown is useless regardless of how good the compound is. Check your frame's actual clearance with a loaded tyre - manufacturers often quote clearance for a clean tyre, not a mud-laden one.