Load rating. Lower typical is lighter and not quite as tough sidewall. Higher is heavier and generally a tougher sidewall. Typically for hauling heavy loads and towing etc. I prefer C rated as the are a softer ride and I’m not a young buck anymore. My hard tail now has a hidden shock too!Sorry dumb question, I’m new to this part, why does one prefer C to E ratings? What does the letter rate?
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