Originally Posted by JustBob
When Woody did the rear on my 8GS I didn't know I had the option for an 18. Dang. Slightly off topic, but he wouldn't make the front 21 tubeless. Don't know why. Anyway, I'll have a new to me '10 KTM 690ER and it comes with the 18/21 combo.
21" rims in 1.6 - 2.15 sizes don't have enough of a bead groove for a TL tire to sit in. That's why Woody can't do a tubeless setup for you.