Trial Magazine - - CONTENTS -

You will al­ways be able to wit­ness a ma­jor hap­pen­ing in the work­shop ar­eas at the Trial World Cham­pi­onship. The tech­ni­cians, me­chan­ics and riders will all be fo­cussing on two ar­eas of ma­chine per­for­mance: the engine and the sus­pen­sion. The rear sus­pen­sion setup has a mul­ti­tude of set­tings, along with the front, and to find out more we spoke with the TRP peo­ple, who can build a rear shock to suit the re­quire­ments of each in­di­vid­ual. It was our reg­u­lar test rider Phil Dis­ney who brought the TRP to our at­ten­tion af­ter he fit­ted one to his Mon­tesa Cota 4RT. Af­ter some more re­search we found that after­mar­ket hard-parts spe­cial­ist Jit­sie could sup­ply the TRP rear shock for many of to­day’s modern tri­als ma­chines. It was time to find out more from the TRP owner Pa­trick Nelis­sen.

The orig­i­nal com­pany ‘Mo­torhuis Thys’ was founded back in 1962 by Jean Thys, who is Pa­trick Nelis­sen’s fa­ther in law. Jean started out as an of­fi­cial deal­er­ship for Honda, BMW,Yamaha and Suzuki mo­tor­cy­cles. Af­ter the torch was passed to Pa­trick and his wife to con­tinue with the com­pany they also took on the deal­er­ship for Mon­tesa tri­als mo­tor­cy­cles, con­tin­u­ing a tra­di­tion as the of­fi­cial im­porter for the last 25 years. Back in 2005 the brand TRP was cre­ated.

Be­ing the im­porter of Wil­bers and Ma­tris shock ab­sorbers, the quest for a spe­cific tri­als shock started which quickly turned into a home­made prod­uct, with the name TRP as re­sult. The first rear shocks were avail­able for the Mon­tesa mod­els, and this was fol­lowed by pro­duc­ing them for the

other mo­tor­cy­cle brands. They were very well re­ceived and soon gained a rep­u­ta­tion for ex­cel­lent build qual­ity and per­for­mance. Now they can of­fer a stan­dard rear shock as a di­rect re­place­ment or their own range of rear shocks, which can be suited and tuned to each rider’s re­quire­ments, of­fer­ing an à la carte menu of ad­just­ments. In gen­eral TRP shocks are 1cm longer or 1cm shorter than the orig­i­nal ones when built. This gives more ‘spring­way’ and is gen­er­ally ap­pre­ci­ated by the av­er­age rider since it makes it eas­ier to han­dle and move the rear end of the ma­chine. For high-level riders that do a lot of their rid­ing on the rear wheel the shock can be short­ened to make han­dling eas­ier for them as well.

Is your rear shock set up cor­rectly?

75 Each shock has a spe­cific spring weight and an ad­justed in­ter­nal set­ting in re­la­tion to the spring used. So a soft and a hard shock will not only have dif­fer­ent springs but also dif­fer­ent shims/parts on the in­side.

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