CrawlKin

Pro-Line Hyrax vs JConcepts Fling King: Rock or Mud?

Updated September 2026

The Pro-Line Hyrax 1.9 G8 wins on rock and hardpack crawling, its G8 compound and sipped open tread gripping stone without squirm. The JConcepts Fling King 1.9 green compound wins on mud and loose dirt, where its mega lug tread flings material clear and the super soft rubber still bites wet rock.

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At a glance

Spec Pro-Line Hyrax 1.9 G8 Rock Crawling Tires (pair) Check price on Amazon JConcepts Fling King 1.9 Crawler Tires Green Compound (pair) Check price on Amazon
Price $22-$28 $24-$30
Our rating 4.7 / 5 4.5 / 5
Best for SCX10 and TRX-4 owners who want the community's proven baseline tire before experimenting with specialty compounds. Crawlers who run mixed dirt, mud, and loose rock where a tightly spaced tread packs out.
Compound G8, balanced traction and stability Green, super soft
Tread style Open lug, deep sipes Mega lug, widely spaced
Foam inserts Sold separately Included in the box
Best terrain Rock and hardpack Mud and loose dirt

Choose the Hyrax for rock and hardpack, the Fling King for mud and loose dirt, since neither tread excels on the terrain the other is built for.

The two options in depth

Amazon Pro-Line Hyrax 1.9 G8 Rock Crawling Tires (pair)
4.7 Editorial score

Pro-Line Hyrax 1.9 G8 Rock Crawling Tires (pair)

The default benchmark for 1.9 inch rock crawling. Open tread with deep sipes and G8 compound that grips rock faces without the squirm of pure competition rubber.

Best for SCX10 and TRX-4 owners who want the community's proven baseline tire before experimenting with specialty compounds.

G8 compound balances traction and tread stability on mixed terrainOpen lug pattern with multiple sipes lets the tread wrap over small edgesAvailable for 1.9 inch standard and Class 1 bead seat
$22-$28 Check price on Amazon
Amazon JConcepts Fling King 1.9 Crawler Tires Green Compound (pair)
4.5 Editorial score

JConcepts Fling King 1.9 Crawler Tires Green Compound (pair)

The mega-lug mud specialist in JConcepts green super-soft compound. Designed to throw loose material and dig into soft terrain where smaller treads pack with mud.

Best for Crawlers who run mixed dirt, mud, and loose rock where a tightly spaced tread packs out.

Large, widely spaced lugs fling loose dirt and mud for continued tractionSuper-soft green compound adds grip on wet rock facesIncludes foam inserts in the box, ready to mount
$24-$30 Check price on Amazon

Which should you buy?

Buy the Pro-Line Hyrax 1.9 G8 if most of your trail time is on rock faces, granite outcrops, or hardpack, since the G8 compound and sipped tread wrap over small ledges without the squirm of a softer competition rubber. It is also the tire most SCX10 and TRX-4 owners already run, so it is the safer default when you are not sure which terrain you will see most. Buy the JConcepts Fling King 1.9 green compound if your local trails run through mud, loose dirt, or wet rock, where a tightly packed tread like the Hyrax can clog and lose bite. The mega lug pattern throws material out of the contact patch instead of packing it in, and the super soft green compound still finds grip on slick surfaces. It also ships with foam inserts already in the box, which saves a separate purchase. Builders who split time between both conditions often keep a spare set of each rather than compromise, since neither tread excels on the terrain the other one is built for. If you can only own one set and your trails are mostly dry rock and hardpack, start with the Hyrax.

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Common questions

Can the Pro-Line Hyrax handle mud at all?

It handles light mud acceptably but is not the specialist for it. The tighter tread pattern can pack with wet dirt faster than the widely spaced mega lugs on the JConcepts Fling King, so a rig that regularly sees mud is better served by the Fling King.

Do I need foam inserts with the Hyrax?

Yes, buy them separately such as {{pro-line-closed-cell-foam-inserts-1-9|Pro-Line closed cell foam inserts}}. The Hyrax ships as tires only, while the Fling King includes foam in the box, which is one reason it costs slightly more per pair.

Which tire is better for a beginner?

The Pro-Line Hyrax G8 is the safer starting point for most builders, since it is the proven baseline tire in the community and performs well across a wider range of terrain. Save the Fling King for once you know your local trails lean toward mud or loose dirt.

Are both tires available in sizes beyond 1.9 inch?

The Hyrax is also sold in a 2.2 inch size for Wraith and RR10 Bomber builds. The Fling King in green compound covers SCX10, TRX-4, Gen8, and Wraith platforms in the 1.9 inch size referenced here.