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Endurotyres.com Tech Tip Michelin AC 10 – AC10 Rear are available in three sizes: – 100/100 for 125cc, 110/100 for 250 cc and 120/90 for 250cc+. In fact the 120 true size is more like a traditional 140. Front AC10 is only for gentle Trail use; we would suggest upgrading to an Enduro comp for any serious off road riding.