I use 10k in mine(RC8T). User preference will vary from vehicle to vehicle and track to track. :)

thx, wat u use for the front n rear for ur truggy? Thx

I normally use about 7k in the front and 2k or 3k in the rear.

Update? I don't see a 50T yet in the store.. maybe I'm missing something? Just the one, and there is no details or options to select spur size.

There is no picture yet, but the item listing is directly above the 46t spur in the store. Maybe I will add it as an option instead of a separate listing so it is easier to see/select.