TL;DR
SunF is an ATV and UTV tire maker, and the reason its name keeps coming up in mini bike threads is simple: the standard mini bike tire, 145/70-6, is an ATV size, so ATV tire makers are where the upgrade treads live. For a 6-inch mini bike wheel, two SunF treads matter — the directional V-groove street tread for pavement and hardpack, and the Power II-style aggressive knobby for loose ground. Both are 6-ply, both are tubeless-ready, and both bolt onto a stock GMB100, GMB100P, Coleman CT100U or CT200U with no rim change. The mistake to avoid: ordering by tread picture instead of by size, and ending up with an 8-inch tire that will never mount on your 6-inch rim.
What SunF Actually Is, and Why Mini Bikes Ended Up on It
SunF builds tires for ATVs, UTVs, go-karts and side-by-sides. Mini bikes were never the target market — they inherited it. When manufacturers specced 145/70-6 as the standard mini bike size, they picked a small ATV size, and from that point the only companies making a range of treads in that size were ATV tire companies.
So when a rider wants something other than the tread their bike came with, the shelf they end up at is SunF's. That is the whole story: availability, not marketing.
FRP's tires are co-branded — the casing is the proven SunF spec, and the sidewall carries FRP x SunF to mark the fitment as one selected and tested for mini bike use rather than an ATV part that happens to fit.
Shop the FRP x SunF Street Tire →
Which SunF Tire Goes on Which Surface
| Tread | How to recognise it | Surface it is built for | On FRP |
|---|---|---|---|
| Street / hard-pack | Shallow directional V grooves, fine siping across the tread, low block height | Asphalt, concrete, packed dirt, turf | FRP x SunF Street Tire |
| All-terrain knobby (Power II family) | Deep staggered lugs, oversized shoulder knobs wrapping the sidewall | Loose dirt, gravel, sand, mud, rock, hill climbs | FRP x SunF All Terrain Tire |
| Chevron (factory tread) | Angled V blocks, medium depth, no deep shoulder lugs | Mixed ground — the all-rounder your bike shipped on | Stock on the GMB100 |
Measured rather than nominal, the FRP x SunF all-terrain tire runs 13.9 in diameter by 5.7 in wide, 6-ply, tubeless — slightly taller and wider than the 13 in x 5.5 in factory chevron, which is worth knowing if your fender clearance is already tight.
Shop the FRP x SunF All Terrain Tire →
The Ordering Trap: a SunF Model Name Is Not a Size
This is where most bad orders come from. SunF sells the same tread family across several sizes — the same knobby pattern exists as a 6-inch mini bike tire and as an 8-inch ATV tire, with the same model name on both. A photo of the tread tells you nothing about whether it will mount on your wheel.
Order by the size, then choose the tread. On a stock mini bike the size is 145/70-6, and nothing else fits. Sizes like 19x7-8 or 20x7-8 belong to bikes that have already had a big-wheel conversion.
The second trap is the rim itself. A 145/70-6 mounts on a 6-inch rim with roughly 4.5 inches of rim width. If a listing quotes a rim width outside that, you are looking at a tire for a different wheel even when the diameter matches.
What They Look Like Fitted
EastSideMiniMobberz fits SunF street tires to a mini bike and rides it afterwards — useful if you want to see the tread height difference against a knobby before you commit:
SunF street tires fitted and ridden — EastSideMiniMobberz, independent rider video
Does a SunF Tire Fit My Bike?
If your bike is on the standard mini bike wheel, yes. The 145/70-6 size is shared across the platform:
- FRP GMB100 — 145/70-6, factory SunF chevron tread
- FRP GMB100 with SunF street tires — the same bike delivered on the street tread, no swap needed
- FRP GMB100P — 145/70-6 on the 2.0 heavy-duty rim, all-terrain tread from the factory
- Coleman CT100U and CT200U — 145/70-6 (later big-wheel trims move to 19x7-8)
- Motovox, Monster Moto, Trailmaster Storm 200 — 145/70-6
Full size decoding, the pressure spec and a model-by-model chart live in the mini bike tire size guide. Want it mounted and ready to bolt on rather than loose rubber? That is the street tire assembly, available front, rear, or as a pair.
Shop the GMB100P with all-terrain tires →
FAQ
Are SunF tires good for mini bikes?
They are the standard answer for a practical reason: 145/70-6 is an ATV size, and SunF makes more tread options in it than anyone aimed at mini bikes. The 6-ply casing is the part that matters day to day — it resists the cuts, punctures, and rim-edge impacts that end most mini bike tires long before tread wear does.
How do SunF tires compare to a premium ATV brand like Maxxis?
Different jobs. Premium ATV brands build for machines that weigh several hundred pounds and are ridden hard enough to tear a casing apart; their compounds and construction are aimed at that. A mini bike carries a fraction of that load at a fraction of the speed, and its tires usually die from punctures, rim-edge impacts, and pavement lug wear rather than from being outrun. The 6-ply SunF casing addresses exactly those failure modes, which is why it is what the mini bike world actually runs.
What is the difference between the SunF street tread and Power II?
Tread geometry, nothing else structural. The street tread uses shallow directional V grooves with siping, built for hard pack and pavement. The Power II-style knobby uses deep staggered lugs and oversized shoulder knobs for bite in loose ground. Same size, same 6-ply construction, same rim.
What size SunF tire do I order for a mini bike?
145/70-6 for any stock mini bike wheel. Ignore model names when ordering — the same tread family exists in 8-inch ATV sizes, and those will not mount on a 6-inch mini bike rim.
Are SunF mini bike tires tubeless?
These 145/70-6 casings are tubeless-ready, which is why a puncture usually deflates slowly instead of instantly. That also means the rim's bead seat has to be clean and undamaged to hold air — see the tubeless vs tube guide.
What is different about the FRP x SunF version?
It is the same proven SunF casing with the fitment picked for mini bike use and an FRP-branded sidewall, sold in the sizes that actually go on these bikes — single or pair, tire only or mounted on the rim. You are not sorting through ATV sizes hoping one fits.
Will fitting SunF tires change my top speed?
Slightly, and not the way most people expect. A taller tire raises effective gearing, so acceleration softens while cruising feel gets steadier; the all-terrain tire measures 13.9 inches against the factory 13. The larger real-world change is rolling resistance and noise on hard surfaces, which is what makes a street tread feel faster on pavement even when the numbers barely move.
Pick your SunF tread: the FRP x SunF Street Tire for pavement and hardpack, the FRP x SunF All Terrain Tire for loose ground, or a mounted street tire assembly for a bolt-on swap. Not sure which way to go? Read street tires vs knobby tires, or how to change a mini bike tire before you order. Bikes rather than parts: the FRP mini bike lineup.
