I need to get these studs off and run some normal tyres. I need some knobs to get me through the odd patch of mud, but fast rolling. Are these a good budget choice? The impac version "smartpac" also made by schwalbe can be had for less than 25 quid with a pair of tubes. I don't do any "serious* mountain biking so if they work on tarmac with the odd muddy puddle towpath I'm all in