Hi, progressive fork springs are fine, the standard ones can give problems. While travelling the Moyale to Isiolo road in Kenya my front tyre (TKC80)on my R80G/S lost 7 of it's knobles, a German friend on a R100GS also with TKC80's had no trouble, the only difference was that he ahd fitted new progressive fork springs and mine were still standard. I think my forks were bouncing too much and slamming back down onto the road surface which was sharp volcanic rock. Both sets of tyres were new in Egypt and bikes were carrying the same load.
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