I've use nyrods for most of my models and have flown in the desert area in the west and all seasons in the mid west (where temperatures vary from below freezing to well over a hundred) and never have had a temperature problem with them. The main thing is to be sure and anchor the guide tubes every 4 to 6 inches inside the fuse or wing so they can not bow. Now on my big models, I always use pull-pull and lately even use that on the small ones as it is lighter and very precise in all aspects when you use the proper Ackerman setup.