I've been looking at getting a CRX... apparently they had 175/70/13's stock.
These are stock for that car but will replace your 155/80's just fine. I ran both size tires on my Rabbit and didn't notice a difference in speed or mpg.
Michelin*X-Ice Xi2
Tire Rack: $290 for a set after mail in rebate. ($90 per)
Discount Tire: $428 for a set, reg price. ($107 per)
http://www.discounttire.com/dtcs/fin...&fcb=&sw=false
Uffda, new tires are 'spensive. Wish some would pop up on CL.