I have a 2004 Southwind with 19.5 Michelin tires. I think they are about 6 years old. I can see small cracks in the sidewall of the front tire. I am wondering if these small cracks are considered ...
The only place you'll get an unbiased eval is at the manufacturer's web site. IMO. Some of them will have a description of cracks and how deep they can be (usually in mm's) and still be ok. Others, you have to contact them.