I think the issue is popularity - they could make everyone ride standard bikes (even tyres if they really wanted to given the previous post re dunlop trials universals) but the entry nos. at trials would plummet. As far as I can tell most of the people who are into classic trials aren't really into old bikes per se - they are into trials and fancy doing sections which aren't going to kill you if you get it wrong. These same people then want the most competetive bike possible and have (seemingly) endless amounts of cash to spend. They also don't want to fanny around restoring a bike themselves, they want as near a new bike as possible with leccy sparks, good brakes etc. etc. Hence lots of folks using new Anglians, otter B40's etc. One thing that really struck me reading classic dirt bike was that all of the fancy bikes they feature weren't built by the owner - I dread to think how much cash people have spent on these things! If you read Don Morleys book on 4 stroke classic trials bikes, all the mods he describes involve a lot of home ingenuity and skill but very little cash. The 80's and 90's pre 65 scene was all about budget trials riding on old clunkers over easy sections. This is no longer the case - its just as much as a cheque book sport as modern trials. As a result the modded bikes have become ridiculous, I was particularly amazed at those 'replica' James frames you can now get. Lets be clear here, they aint replicas cos they have no lugs, the angles are different and they way several pounds less than the last offering from either james or fanny b. And as for billet cub hubs for