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anyone know why yoshi kono at 3rensho produced so many trippy looking frames and yet none of the other njs builders seem to have done so. did he have japanese surrealist art funding or something or just a low boredom threshold. never seen a wobbly tubed nag.

I think its because 3Rensho's setup was larger & more ambitious than most other builders brands. Most builders work alone and have little time to redesign frames as they are kept busy building NJS frames for keirin riders. Yoshi Konno had a few world class builders working for him and very rarely built frames himself giving him lots of time to work on design, export & general expansion on their lines.
Most NJS frame builder do make crazy frames, just most them are probably with the builder or customer. Yo do see crazy Gan Well Pro's a fair bit & Yanagisawa.