So I am looking to get a new set of tires for my GS, but I have been running into a supply problem from many vendors. It seems many of them will have a rear tire, but the front is out of stock and has been for some time. So I am leaning towards a set of Continental TK70's, and of course I can find the rear tire in the correct size, but not the front. So I did find a front tire but the size is slightly different. Any thoughts of running a 120/70r19 on the front instead of the 110/80r19 the bike calls for? Thanks in advance.