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I had the 520! Happy student days mountain biking in Auvergne.
The 510 was 3 main tubes cromo, with full LX groupset as a special edition. The 520 was main tubes, stays and forks cromo but stx RC groupset. Both in same price range. The hours spent with my friend debating which one to get... We went for the better frame.
Decathlon had introduced a titanium frame that year too, sub 10kg mountain bike was mind blowing to us back then...