Bueno, creo que he ganado. Aquí está sacado del reglamento de la FIM
01.49 TRIAL TYRES
49.01
The overall width of the tyre when fitted must not exceed 115 mm.
49.02
The tread depth (A) must not exceed 13 mm measured at right angles to the face
of the tread. All blocks in the same circumference must be of the same depth
(see diagram D bis).
49.03
The space between the blocks must not exceed 9.5 mm across the tyre (B) or
13 mm in a circumferential direction (C).
49.04
The space between shoulder blocks (D bis) must not exceed 22 mm.
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49.05
The space across the thread (E) cannot extend completely across the tyre
measured at right angles to the wall of the tyre, unless broken by a block.
49.06
All thread blocks (shoulder blocks excepted) must be nominally rectangular with
sides parallel with or at right angles to the tyre axis (tyre must have same
appearance when reversed and conform, in principle, with Diagram D bis).
49.10
Only tyres normally available from commercial or retail sources for use on the
public highway are authorised.
49.10.1 They shall appear on the tyre manufacturers range catalogue or
tyre specification lists available to the general public
49.10.2 They must be manufactured to comply with European Tyre and Rim
Technical Organisation (ETRTO) requirements in respect of load
and speed codes and have a minimum service description of 45M.
Ahora cabe preguntarse porqué legislar sobre una cosa tan tonta (ya no tan tonta después de la explicación de Jesús) como el dibujo de los neumáticos de trial… aunque viendo los intentos de la FIM por legislar sobre el uso de los 4T…. :silly:
Con respecto al ‘topic’, hace casi 25 años, Mario Borrás, ingeniero de OSSA y creador de «la amarilla» quiso probar con ruedas de 23» delante y 20» detrás, en la creencia de que se pasarían mejor los obstáculos (los de aquella época, osease), pero no pudo quitarse la duda porque ni Pirelli (la que partía la pana entonces) ni Michelín (que estaba preparando el ataque) quisieron fabricar neumáticos de esas medidas.
Saludos, JM.
