Certainly a good few thousands of pairs sold each year i'd say - It's actually quite rare that they get a massive meeting like the Euro's where Schumacher's are THEE tyre to use as it's usually been on Dirt in the past.....
You can only imagine how many sets of Proline Holeshots get sold world wide though, think of all the small clubs alone in the States where they are pretty much always regarded as the best tyre on dirt - plus all the big races they have - remembering it's a set per run usually, then all the other countries that primarily run on Dirt tracks!
I think Ballistic are the only company to come close to the schumacher tyre but they've tried quite a few different things now but still not actually beaten the Schumacher Yellow minispike - Even those GRP tyres which were a great idea seemed to die off....
I think the original reason Ballistic did so well was mainly down to price but they're no cheaper now so in the dry a minispike works better generally, in the wet i'd agree Ballistic spikes are going to be better or sometimes Pinks can work at certain tracks but mainly in the UK Grass or Astro favours the Schumacher tyre so make some Identical for £5 a pair and you'll be laughing
