Omni-Terminator Wheels, Tires and Body Shells: Sizes, Swaps and What Actually Fits
Short answer: The Omni-Terminator runs 104 mm (4.1 in) tires on a 12 mm hex. Slightly taller 2.8-inch monster-truck tires such as the JConcepts Magma (about 108 mm) are a popular owner swap. Much taller tires need a stronger servo and lower gearing. For bodies, match the 251 mm wheelbase; a clear 1/10 mini-MT or truggy-style shell can be trimmed to fit.
Independent guide. RcFanz is not affiliated with, endorsed by or sponsored by Rlaarlo, JConcepts or any brand mentioned; model names are used only to describe compatibility. Some links on this page may earn us a commission; see our disclosure. Upgrading electronics can void warranties and raises crash and LiPo fire risk, so follow your ESC and battery manuals. Fit information comes from maker specs and owner reports; confirm your version before buying.
By RcFanz Team · Updated: Nov 9, 2026
Contents
Wheels, tires and bodies are the cheapest way to change how an Omni-Terminator looks and drives, and the easiest place to buy something that does not fit. Here are the exact sizes, what owners run, and what each change does to gearing and steering.
Omni-Terminator fit chart
| Spec | Value |
|---|---|
| Stock tire diameter | 104 mm (4.1 in), all versions |
| Wheel hex | 12 mm stock; 17 mm via adapter sets |
| Wheelbase | 251 mm (9.9 in) |
| Length / width / height | 410 / 288 / 172 mm (16.1 / 11.3 / 6.8 in) |
| Stock body | 1.2 mm polycarbonate (PC) |
| Maker spare parts (text only) | Wheels and tires mounted pair R11082; paddle sand tires R11152; bodies R11077 green, R11078 black, R11079 clear |
| JConcepts Magma 2.8" pre-mounted (1/10 MT) | 108 mm (4.25 in) OD, 51 mm (2.0 in) wide, 12 mm hex adaptor installed. Fit on the Omni-Terminator is owner-reported: confirm offset and arm/shock clearance |
| Generic 2.8" MT wheel sets (12 mm hex) | Often about 118–122 mm (4.66–4.8 in) OD: taller than stock, so gearing gets taller and the servo works harder |
Tire options: stock, Magma, 2.8" MT, paddles and street
| Tire | Diameter | Hex | Best surface | Effect on gearing |
|---|---|---|---|---|
| Stock | 104 mm (4.1 in) | 12 mm | Mixed ground | Baseline |
| JConcepts Magma 2.8" pre-mounted | 108 mm (4.25 in) | 12 mm | Dirt, bash | About +3.8% effective gearing |
| Generic 2.8" MT set | About 118–122 mm (4.7–4.8 in) | 12 mm | Grass, rough ground | About +13–17% effective gearing |
| Paddle sand tires (maker spare R11152) | Check listing | 12 mm | Sand | Check the listing diameter |
| Street / belted tires | Check listing | 12 mm | Pavement | Ballooning at speed: belted tires resist it |
JConcepts Magma (owner favorite)
Owners like the Magma because it is only slightly taller than stock and grips well on dirt. Buy genuine tires from the brand's official store or an authorized retailer, and avoid look-alike listings: copies often have the wrong diameter and a hard compound.
Paddles for sand
Paddle tires dig and throw sand for traction and look great, but they add drag on hard surfaces and wear quickly on pavement. Keep them for sand and loose dirt.
Street and belted tires for speed runs
At high rpm, unbelted tires balloon (grow in diameter), which changes gearing and handling. Belted street tires hold their shape for speed runs, but they have almost no grip off-road.
Going bigger: what changes
Tire diameter scales your effective gearing directly. Going from 104 mm to 108 mm is about +3.8%; going to 118 mm is about +13.5%, which is similar to adding roughly two pinion teeth on the Metal. The result is a hotter motor and more load on the servo and CVDs.
- Gearing: if you go up in tire size, consider dropping a pinion tooth. See the gearing guide.
- Servo: bigger tires need more steering torque. If the servo hums or slow-steers after the swap, it is overloaded.
- CVD angle and wear: taller tires raise ride height and steepen the CVD angle. See the CVD fix guide.
- Rubbing at full lock: check the tire does not rub on the arms or shocks when steering is at full lock.
Owner verdict: modestly bigger tires are fine; huge tires are usually not worth it, and at least one owner who tried much bigger tires went back to stock.
12 mm vs 17 mm hex and adapters
"Hex" is the size of the drive hex that the wheel slides onto. The Omni-Terminator uses 12 mm. 17 mm hex wheels (the standard on 1/8-scale vehicles) can be used with 12-to-17 mm adapter sets. Adapters widen the track, which adds stability but also more leverage on the hubs. Use thread lock on the adapter screws, check the wheel nut thread and offset, and look for wobble after the first run.
Wheel wobble and balancing
If a front wheel wobbles, work through this list in order:
- Wheel nut loose or cross-threaded.
- Worn or dry bearings.
- A bent dog bone or bent centre shaft.
- Worn hub or knuckle.
- An out-of-balance tire.
Fixes for the drivetrain items are in the hub wobble section of the durability guide.
Body shells: stock, clear and swaps
Match the 251 mm wheelbase and the 288 mm width, then check where the body posts land. The stock body is 1.2 mm polycarbonate. A clear shell can be trimmed and painted to suit.
Black body look
The stock black and clear bodies are maker spare parts. The easy alternative is to paint a clear body black: use polycarbonate paint, paint the inside, and mask the windows.
Bodies owners have fitted
Owners report that Hyper 10 TT bodies fit, and that some truggy and Stampede-style bodies work with trimming and post adjustment. Treat each of these as a starting point and confirm the fit.
3D-printed bodies and skids
3D-printed roof skids and body parts exist for this platform. Check the dimensions before printing.
Avoid copies. Do not buy a body shell that copies the stock Omni-Terminator shell design, or a tire that imitates JConcepts. Buy branded tires only from the brand's store or an authorized retailer.
Mounting: body posts, clips and protection
Adjustable body posts let you set the height; use body clips with a drop of tape or a body washer, put a strip of foam inside the roof, and consider printed roof skids and a brace to stop cracking at the post holes.
Painting a clear body (quick guide)
- Wash the inside of the body with dish soap and let it dry.
- Mask the windows with PC masking film or tape from the inside.
- Spray PC-specific paint on the inside, in thin coats.
- Back-coat with silver or black so the colour is solid.
- Peel the protective film from the outside when dry.
- Trim the body and ream the post holes.
Upgrade parts on AliExpress
A generic tire and wheel set for the larger-tire route described above. Check diameter and hex size on the listing against the fit chart before you order.
YSIDO 110 mm short course truck tires, 12 mm hex (set of 4)
From $20.29 · Seller: YSIDO Store
Price correct as of Nov 9, 2026 and may change
Pre-mounted set of four 110 mm tires on 12 mm hex wheels. That is larger than the stock 104 mm, so read "Going bigger" above for clearance and gearing changes first.
View on AliExpressThe buttons above are AliExpress affiliate links; a purchase may earn RcFanz a commission. Product details come from the seller's listing, so confirm the specs there.
FAQ
What size are Omni-Terminator tires?
104 mm (4.1 in) in diameter on a 12 mm hex wheel.
What wheel hex does the Omni-Terminator use?
12 mm. 17 mm hex wheels need 12-to-17 mm adapters, which widen the track.
Do JConcepts Magma tires fit the Omni-Terminator?
The 2.8-inch pre-mounted Magma (about 108 mm, 12 mm hex) is an owner-reported swap. Check the offset and the clearance at full steering lock.
Will bigger tires make my Omni-Terminator faster?
Slightly: going from 104 to 118 mm is about +13% effective gearing. But it also loads the motor, servo and CVDs more.
Do I need a new servo for bigger tires?
Not for a small change like the Magma, but much bigger tires add steering load. If the servo hums or steers slowly afterward, upgrade it.
Can I run 17 mm hex wheels?
Yes, with 12-to-17 mm adapters. Use thread lock and watch for wobble.
Why do my front wheels wobble?
Check the wheel nut, bearings, dog bones and centre shaft, hub wear and tire balance, in that order.
What other body shells fit the Omni-Terminator?
Bodies made for about a 250–255 mm wheelbase. Owners report Hyper 10 TT bodies fit, and some truggy-style bodies work with trimming.
How do I get the black Omni-Terminator look?
Paint a clear polycarbonate body black on the inside, or use the maker's spare black body.
Is this an official Rlaarlo guide?
No. RcFanz is an independent site and is not affiliated with Rlaarlo.
Sources
Sizes come from the maker's manual and spec pages and from retailer data; effects on gearing are calculated; owner experience is paraphrased and labelled as owner reports.