Tires are the single biggest variable in how a rock crawler hooks up. Compound softness, tread spacing, and the foam insert underneath all interact, so the right set can fix a rig that feels underpowered when the motor is actually fine. This guide picks the tires worth buying for 1.9 inch SCX10 and TRX-4 builds, adds a 2.2 inch option for Wraith-class rigs, and covers when a foam upgrade is worth it. Check the live listing for current price and box contents before you order.
Quick answer
The Pro-Line Hyrax 1.9 G8 is the best all-around tire for most RC rock crawlers, pairing an open, siped tread with soft G8 compound. Choose the JConcepts Fling King green for mud and loose dirt, the JConcepts Bounty Hunter for all-terrain value, and the Hyrax 2.2 G8 for Wraith-class rigs.
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What makes a crawler tire grip on rock?
Pro-Line's Hyrax 1.9 G8 shows the three things that make a crawler tire grip: a soft compound, an open lug pattern with sipes, and a foam insert underneath, per the tread and compound notes in our product catalog.
Compound sets how much the rubber deforms against rock. Our catalog places G8 between harder compounds and the stickiest competition rubber, which is why it suits most trail and backyard crawlers. Softer compounds such as the JConcepts green rubber and INJORA S5 add bite on wet rock, while trading away some durability on abrasive surfaces like concrete or sharp granite.
Tread spacing decides what the tire does in loose material. Open, siped lugs like those on the Pro-Line Hyrax 1.9 G8 Rock Crawling Tires (pair) let each lug flex over small edges, and the widely spaced mega-lugs on the JConcepts Fling King 1.9 Crawler Tires Green Compound (pair) throw mud out of the contact patch instead of packing it in. The foam insert, covered further down, controls how the sidewall behaves under side load.
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.
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.
1. Pro-Line Hyrax 1.9 G8
The Pro-Line Hyrax 1.9 G8 is the all-around pick for SCX10 and TRX-4 rock crawlers, and Horizon Hobby's listing for part PRO1012814 shows two tires and two open-cell foam inserts in the box.
Shop the Pro-Line Hyrax 1.9 G8 Rock Crawling Tires (pair) pair when you want the community baseline before experimenting with specialty compounds. The open lug pattern with multiple sipes lets the tread wrap over small edges, and the G8 compound grips a rock face without the squirm of pure competition rubber.
The trade-off is cost and stock. It costs more per pair than budget import alternatives, and stock varies by shop, so check availability before you plan a build around it. Pro-Line also lists a separate Class 1 Hyrax with a 4.19 inch outer diameter for Class 1 rules, so pick the version that matches how you run.
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.
2. JConcepts Fling King 1.9 Green Compound
The JConcepts Fling King 1.9 in green compound is the pick for mud, loose dirt, and wet rock, pairing large, widely spaced lugs with what our catalog lists as a super-soft compound and foam inserts in the box.
Choose the JConcepts Fling King 1.9 Crawler Tires Green Compound (pair) when your trails pack a tighter tread with dirt. The mega-lug layout clears loose material so the lugs keep finding traction, and the green rubber adds grip on wet faces.
Expect two compromises on hard ground. The chunky tread creates slight vibration on smooth hardpack, and the big lugs put less rubber on flat rock than a tighter pattern does.
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.
3. JConcepts Bounty Hunter 1.9
The JConcepts Bounty Hunter 1.9 is the all-terrain value pick, using a dual-angular mirrored center lug design that our catalog credits with bite on rock and traction in loose material at a lower price than the Fling King.
Use the JConcepts Bounty Hunter 1.9 Scale Crawler Tires (pair) when you want one tire that handles mixed terrain and leaves budget for other upgrades. The mirrored lugs grip in multiple directions, and the clean scale look suits most body styles.
It is not as aggressive in deep mud as the Fling King, so pick that tire instead if mud is most of your running. Check the listing for what ships in the box before you order, since contents can differ by seller.
JConcepts Bounty Hunter 1.9 Scale Crawler Tires (pair)
Class 1 tire with a dual-angular mirrored center lug combination for bite on rock and traction in loose material. A strong all-rounder just below the price of the Fling King.
4. INJORA King Trekker 1.9 S5
The INJORA King Trekker 1.9 S5 is the import option for soft compound grip, and Discount RC Parts lists part T1914 as a set of four 118x42mm tires with four foam inserts.
The INJORA King Trekker 1.9 Crawler Tires S5 Compound (pair) pairs INJORA's S5 super-soft compound with multi-curve siping, which improves bite on loose dirt and slippery rock faces. Because some listings sell it as four tires rather than a pair, compare the per-tire price before setting it against Pro-Line or JConcepts.
The open question is longevity. Its compound durability over many sessions is not as proven as Pro-Line G8, and there is less community data on how it performs across every terrain type.
INJORA King Trekker 1.9 Crawler Tires S5 Compound (pair)
INJORA's S5 super-soft compound in an all-terrain tread with multi-curve siping for grip on loose dirt and slippery rock faces. A strong import option.
5. RC4WD Interco Super Swamper TSL Bogger 1.9
The RC4WD Interco Super Swamper TSL Bogger 1.9 is the scale-look pick, a licensed replica of the full-size Interco tread in RC4WD's X3 soft compound, per our product catalog.
Pick the RC4WD Interco Super Swamper TSL Bogger 1.9 Scale Tires (pair) when visual accuracy matters as much as traction, such as on a scale trail build. The X3 compound provides decent grip on rock, but the reinforced sidewall flexes less than an open-carcass competition tire, so it wraps ledges less readily.
Inspect the set before the first run. The tires occasionally arrive slightly oval from packaging, so mount them and check their shape on the wheel before you hit the trail.
RC4WD Interco Super Swamper TSL Bogger 1.9 Scale Tires (pair)
Licensed replica of the full-size Super Swamper Bogger in X3 soft compound. A scale showpiece as much as a performance option.
What should you run on a 2.2 inch rig like the Wraith?
The Pro-Line Hyrax 2.2 G8 is the tire for 2.2 inch builds such as the Axial Wraith and RR10 Bomber, carrying the same G8 compound as the 1.9 version in a larger footprint, per our product catalog.
The Pro-Line Hyrax 2.2 G8 Rock Crawling Tires (pair) only fits 2.2 inch bead lock wheels, so it is not a swap for a stock 1.9 platform. The larger diameter adds clearance, but the tire is heavier than a 1.9, which changes how the rig handles.
Pro-Line Hyrax 2.2 G8 Rock Crawling Tires (pair)
The 2.2 class version of the benchmark Hyrax, sized for Axial Wraith, RR10 Bomber, and custom builds. Same G8 compound, bigger footprint.
Do you need to upgrade the foam inserts?
Pro-Line Closed Cell Foam Inserts 1.9 are worth adding only if your tires fold on off-camber side hills, because the Hyrax and the Fling King both already ship with foam, per Horizon Hobby's Hyrax listing and our catalog's Fling King entry.
The Pro-Line Closed Cell Foam Inserts 1.9 (pair) add a fully supported sidewall under lateral load, which stops the tire folding on steep camber without stiffening the tread face. The trade is a little less rock wrap than softer open-cell foam.
Sizing matters. Match the insert to your tire brand's inner diameter, and confirm current pricing on the live listing, since insert prices move between retailers.
Pro-Line Closed Cell Foam Inserts 1.9 (pair)
Firm closed-cell inserts that add sidewall support and prevent the tire from folding under side loads on steep off-camber sections. Sized for standard 1.9 inch crawler tires.
How do you match a tire to your wheels?
Pro-Line, JConcepts, INJORA, and RC4WD name every tire in this guide by wheel size, 1.9 or 2.2 inch, so read the size marked on your current wheel or tire before ordering rather than guessing from the model name.
Width matters too. Check that the tire matches the wheel width you run, because a mismatch can balloon or pinch the sidewall. If you run bead lock wheels with replaceable inner rings, the INJORA Brass Inner Clamp Rings for 1.9 Bead Lock Wheels (set of 4) add weight at the wheel for a lower center of gravity when you remount the new tires.
INJORA Brass Inner Clamp Rings for 1.9 Bead Lock Wheels (set of 4)
CNC-machined brass inner rings that replace the stock aluminum or plastic clamp rings in 1.9 bead lock wheels. Each ring adds meaningful mass at the lowest point of the rig for lower CG.
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.
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.
JConcepts Bounty Hunter 1.9 Scale Crawler Tires (pair)
Class 1 tire with a dual-angular mirrored center lug combination for bite on rock and traction in loose material. A strong all-rounder just below the price of the Fling King.
INJORA King Trekker 1.9 Crawler Tires S5 Compound (pair)
INJORA's S5 super-soft compound in an all-terrain tread with multi-curve siping for grip on loose dirt and slippery rock faces. A strong import option.
Pro-Line Closed Cell Foam Inserts 1.9 (pair)
Firm closed-cell inserts that add sidewall support and prevent the tire from folding under side loads on steep off-camber sections. Sized for standard 1.9 inch crawler tires.
FAQ
Frequently asked questions
What is the best all-around tire for an RC rock crawler?+
For most 1.9 inch SCX10 and TRX-4 builds, the Pro-Line Hyrax 1.9 G8. Its open, siped tread and G8 compound balance rock grip with tread stability, and Horizon Hobby lists it with two open-cell foam inserts in the box.
Which crawler tire is best for mud?+
The JConcepts Fling King 1.9 in green compound. Its widely spaced mega-lugs throw mud and loose dirt out of the contact patch, though the chunky tread vibrates slightly on smooth hardpack.
Do crawler tires come with foam inserts?+
Many do. Horizon Hobby lists the Pro-Line Hyrax 1.9 G8 with two open-cell foam inserts, our catalog lists foam in the box for the JConcepts Fling King, and Discount RC Parts lists the INJORA King Trekker S5 set with four inserts. Check each listing, and buy firmer closed-cell inserts separately only if your tires fold on side hills.
Can I put 2.2 inch tires on a 1.9 inch crawler?+
Not on the stock wheels. A 2.2 tire such as the Pro-Line Hyrax 2.2 G8 needs 2.2 inch bead lock wheels. The bigger tire adds clearance but also weight, so it suits a rig built for the 2.2 class.
How long do soft crawler tires last?+
It depends on the surface. Concrete and sharp granite wear soft compound faster than dirt trails, so inspect the lug tips after each session for the first sign of rounding.