Buyer Guide: Use durometer + rollout to pick the right compound and size—then tie that choice to how you want the kart to feel on track.
Shop all tires | A40T 10.5x5.0-6 | A40T 11.0x9.0-6 | A50T 11.0x9.0-6
Quick answer
- A40T is the softer option (typical durometer listed as 45).
- A50T is the harder option (typical durometer listed as 57).
- Rollout examples from the listings: 33.25" for 10.5x5.0-6 A40T, and 34" for 11.0x9.0-6 A40T/A50T.
What “durometer” really tells you
Durometer is a hardness indicator. It’s not the only variable that matters, but it’s a fast way to understand where a tire sits on the softness/hardness spectrum when you’re deciding between compounds.
- A40T (typical durometer: 45) → generally the “softer feel / more compliance” direction.
- A50T (typical durometer: 57) → generally the “harder / more consistent” direction.
What “rollout” means (and why it matters)
Rollout is how far the tire travels per rotation under real-world conditions. Even before you change sprockets, rollout can affect how the kart “gears” the track and how quickly RPM comes in.
- 10.5x5.0-6 A40T lists rollout: 33.25"
- 11.0x9.0-6 A40T lists rollout: 34"
- 11.0x9.0-6 A50T lists rollout: 34"
When to choose A40T vs A50T
Choose A40T if you want:
- A softer compound direction (typical durometer: 45)
- More compliance/feel and a tire choice aligned to how you want the kart to “talk back”
- Options: A40T 10.5x5.0-6 or A40T 11.0x9.0-6
Choose A50T if you want:
- A harder compound direction (typical durometer: 57)
- A more “consistent” feel depending on your conditions and style
- Option: A50T 11.0x9.0-6
Simple buyer paths (what most racers should do)
- If you’re choosing primarily by compound direction: A40T (45) vs A50T (57)
- If you’re choosing by rollout/size needs:
- 10.5x5.0-6 A40T → rollout 33.25"
- 11.0x9.0-6 A40T → rollout 34"
- 11.0x9.0-6 A50T → rollout 34"
FAQ
What durometer is listed for A40T and A50T?
A40T is listed as 45 (typical) and A50T is listed as 57 (typical) on the Toigo product pages.
What rollout is listed for these tires?
33.25" is listed for the 10.5x5.0-6 A40T and 34" is listed for the 11.0x9.0-6 A40T/A50T listings.
Where do I start if I’m not sure?
Start on the tires collection page, then pick compound + size based on what you want the kart to feel like: Shop all tires.