XB2, XT2, SCX +2 Toe +1 HRC C Block

Introducing our +2 Toe / +1 High Roll Center C Blocks

For XB2 and XT2 Series Cars

Over the last year, we’ve tested nearly every C and D block configuration available for these cars, searching for what works best—not just for top-level competitors, but for the average racer as well. What we found was a clear trend across most setups:

• Maximum rear width
• The highest possible roll center (C or D)
• 0–1° of rear toe

At Hot Lap Design, our goal isn’t just to make cars faster—we want to make them more versatile.

 The Slot C Block is designed to be used with the Chassis Brace. It has +2 Toe to allow for Wider Pivot Width. This is what every stock racer wants. A car that rotates faster and flatter. Combine this with the C +1 HRC and you have a weapon that can not only turn more, but faster also.

Four those looking for a more aggressive option, after extensive time with the ’24 platform and now deep development on the ’25 and ’26 cars, especially for U.S. carpet tracks, a few issues became very clear:

• The chassis brace is a band-aid
• Rear roll center is too low
• The car has excessive off-power steering

We’ve already addressed some of these issues with parts like our Smooth Steering Plates, but the chassis brace itself creates bigger problems. First and foremost, it negatively affects weight distribution. For a car to be aggressive and consistent, it needs to flex and rotate correctly through the corner.

Proper flex promotes rear grip and prevents the inside rear tire from lifting, allowing the car to rotate naturally instead of micro-sliding through corners. The result is a more planted car that resists over-rotation—especially in tight, low-speed sections.

With these changes in place, the 5-gear transmission went from feeling loose in the rear to becoming an absolute weapon. The car now drives harder into the corner, carries more speed through it, and exits with what feels like unlimited rear grip.

Where Our Flat C Block Comes In

Our newly designed C block eliminates the chassis brace slot entirely, creating a stronger and more rigid block from the start. Removing the brace allows you to reduce rear weight, and when combined with the 5-gear transmission, it shifts a significant amount of mass forward. 

This change allows the battery to move back toward the of the chassis instead of being forced all the way forward to promote grip. The result is a better-balanced car with increased consistency, more overall grip, and steering that’s not only aggressive—but far more usable.

These are best paired with the 3 Degree Xray Block or our own +1 HRC 3 Degree Block. When using the Xray Block Center Center will be 3 Anti Squat.

Slot fits standard on ‘25, ‘26 XB2. Flat fits standard on the XT2 & XB2 ‘24. The Flat Block is also for those that want to remove the chassis brace when running the 5 gear on the ‘25 & ‘26 XB2.