Senior Member
Join Date: Sep 2012
Location: Brighton, Michigan
Posts: 658
Bikes: Optima Baron LR, '14 Nishiki Maricopa,'87 Trek 330 Elance, '89 Miyata 1400, '85 Peugeot PGN10, '04 Fuji Ace, '06 Giant Rincon, '95 Giant Allegre, '83 Trek 620, '86 Schwinn High Sierra
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I've seen one sidewall of a GP 4000 SII being blown out. It was a tour out of Fenton MI, if I recall correctly. A female cyclist had to make a call of shame when her sidewall blew out.
I've got three sets of GP 4000's and a single GP 5000 set across 4 bikes. No problems on any of those, minus the occasion shard of glass flat.