I want to get some inserts for my Sorex 28. But what is the difference bettween type A, Type B and type C? Is it the thickness.

A is the thickest, C is the thinest,

at CH I found the B med the best, MB24M

So what does thicker or thinner inserts do for grip/handling?? What should you use in different conditions?

HMMmmm do the 24s wear much??? Although it is getting pretty cold at the moment.

This is from a recent post in the Electric On-Road Forum, i dont know enough about it but it sounds reasonable enough

Generally when the traction is super high, people will use a harder insert to help support the tire better. It decrease forwards bite and side bite. Usually try to run as hard as insert you can and still have the overall bite you need.

Air gap is what controls the amount of forward bite you have. Bigger air gap means more forward bite, smaller air gap means less forward bite, but better support for the tire, and generally less tire wear. The air gap lets the tire squirm around more and conforms to the road much better. I like a large air gap on tracks with lots of slow corners and when the track is a touch bumpy, and I like less airgap on smoother, bigger, and faster tracks to decrease rolling resistance, and so the tire just doesnt fold over on it self in the high speed corners.

An air gap also lets tires heat up quicker, and they dont get to as high of a temp (because there is air fowing around inside the tire and stuff assuming you have big enough hols in your rims) Less air gap will generally take a bit longer to heat up, but they will get to a higher final temperature. I will usually think about it when I'm racing outdoors in really hot weather to keep the tires from overheating.

To change your airgap you get different inserts. Thinner inserts like the Yokomo 039 series and the Sorex type C inserts have a large airgap because they are thin inserts. The HPI, Sorex type A, and yokomo 037 inserts are thicker, and have thicker profiles, so they will fill the inside of the tire up more giving you less airgap. Sorex type B inserts fall right in the middle in my opinion.

Thanks for the help

Like Rod said, go for the Type B mediums. I tried the different sorex inserts at Castle Hill, Type A's gave alot of steering and grip, but would cook up very easily, even when it was cold (that was a long time ago now). the Type C's were good for oversteer, but I have seen people use them with Sorex 36's with no problems.

I use A's and I find them heaps better on really cold night like we have had over the last few race meets. Keeps the temp in the tyres.

Also one thing to consider is they all look the same. I for one have been running the same inserts (c-med) and then just try to setup my car to different tracks. You can always mark the inserts but if your planning on running a sanctioned controlled tyre event then it will be best to use the same.