X4'26 TechTips

Down & Upstop measurement

The #107730 HUDY Droop & Upstop Set-Up Tool is not yet available. We're sorry for the inconvenience. But it is possible to set both the downstop and the upstop also without the gauge.

Downstop: You can set the downstop using the previous method, with the older style #107714. Gauge. For example, when using 0.5mm under the front hub, and 1.0mm under the rear hub (as suggested in my previous post), start with a downstop value of 6.6 front and 4.4 rear (measured under the arm). This equals to 23.6 front and 22.4 on the new gauge (see picture for details).

X4'26 Quick FAQ!

There's a few questions about our new TC which I've received more than once. Some which are not answered in the manual or in the tech tip videos.

Q: Is it possible to convert my X4'25 to a 26? A: About 70% of the parts are new. Technically, you can. But it’s cheaper to buy a new kit.

Q: Which spare & option parts carry over from the 25 to the 26? A: Shocks, springs, PSS for shocks, spur gear, layshaft, belts, hubs, steering system, ball bearings (except for diff bearings), drive shafts, hexes, belt tensioners, T-brace, battery mounting system, bumper parts, upper link arms, motor mount (without countersunk can't be used for 1.5mm chassis), body posts

Q: What tools do you recommend getting for the 26? A: The same tools as you would use for the 25, with the addition of the HUDY #107730 Droop & Upstop tool.


Q: Are the CFF upper arms the same as those on the 22/23 cars? A: No, they're not compatible, although, the 26 arms have a resemblance to the 22/23 upper arms.

Q: What set-up should I start with for carpet racing? A: Take a look at this post from Adam Izsay.

Q: What set-up should I start with for asphalt racing? A: Take a look at the basic suggested set-up.

Shock Holder Ajustements

When using shock holder flex alternative #2 or #3 from the manual, use both screws when mounting, for a perfect alignment of the shock holder - but only tighten the one that you plan to use. Afterwards, remove the screw that was used for alignment. This will guarantee a perfectly straight shock holder, which will reduce the chance of suspension tweak and/or clearance issues!