I purchased the comfort models once some 25 years ago for a 1970 250 and I found that they were fine for the first few thousand miles but then they softened up and rode too soft for my liking .... especially in corners or mountain roads. Since then I've always purchased the Heavy Duty models and have been very pleased even when driving "spirted" through mountain roads. I've never purchased the sport models .... because I was afraid they would be way too stiff.