quick_spider Posted September 7, 2005 Report Share Posted September 7, 2005 I'm hoping to start comps again on my 24" but I'm wondering what the rules actually are? As far as I was aware, stock was classified on outside tyre diameter - hence why monty could use a '25"' on their stock bike. My 24" tyres are only a tiny bit smaller than a normal trials tyre, and certainly as high as the xc tyres on my other bike. Anyone who actually knows or has a copy of the rules in writing care to enlighten me? The ACU book I have doesn't refer to the spec of the bikes so I guess it must be set by the BUI/UCI and regulated by biketrial-uk. Jon Quote Link to comment Share on other sites More sharing options...
ghosts_cloak Posted September 7, 2005 Report Share Posted September 7, 2005 Hi, Im interested in hearing what the rules say also, as I have a 24 inch bike also and if/when I get decent enough to enter a comp it would be nice not to have to buy a second/new 26 inch bike!! ~Gaz Quote Link to comment Share on other sites More sharing options...
Mark W Posted September 7, 2005 Report Share Posted September 7, 2005 Yeah, outside diameter has to be >26" I believe. So with a 24"er, most tyres will give the girth needed to be legal. People might throw a hissy fit, and from how idiotic some 'top' comp riders can be they might appeal if you, say, won and try and have your win taken away or whatever, but most club trials (e.g. YMSA, Tyketrial, etc.) will be OK with it? Double check with the club before hand maybe... Quote Link to comment Share on other sites More sharing options...
Will Arnold Posted September 7, 2005 Report Share Posted September 7, 2005 i always have the view that for stock, you have to have 26" wheels and 5/6 working gears. anything other than that would be entered in mod, because it has been modified from the stock standard. Quote Link to comment Share on other sites More sharing options...
Monkey Posted September 7, 2005 Report Share Posted September 7, 2005 (edited) The way tyres are measured (the English system) is to start from the outside and measure inwards. This is why bikes with 20"x2.4" tyres have the same diameter as 20"x2.5" (and 20"x1 3/8" if you like), and also why they can't fit on each others rims. Historically if you think about it, 26"x1 3/8" tyres won't fit on a rim for mountainbike or 26"x1.75". If all that made sense, you can see why Monty can get away with a 25" rim (use monstrously tall tyres) and that to get away with a 24" mountainbike sized rim you would need something like 26"x4" tyres... :P :( In other words, a tractor in the form of a bicycle. I should mention that the French (continental?) system is based on the size of the rim. That's why tyres marked 700x52 are called 29" tyres for mountainbiking purposes. What would you call a 29" wheeled trials bike... anyone? P.S. If I find out I'm making this up, I'll be quite embarrassed. Edited September 7, 2005 by Monkey Quote Link to comment Share on other sites More sharing options...
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