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Have one for 4 years now. It's the rim brake version. Can't talk about technical stuff, Im no expert. However, from experience its a very nice ride. I like the details (ti seatclamp) external routing so no real faff if you wanna cable or re-cable. Headset was the same as the Giant ones but I got the Jguillem branded ones. Press fit bb (if that matters to you). Have fit 28mm pro-ones on pacenti sl23 which had plenty of space left, could probably go 30 but haven't tried. Currently on 25c vittoria corsas on hed belguim which again has plenty of space of wider tyres.
Has anyone ridden a J Guillem Major frame? Thinking of ordering one, but there doesn't seem much info around about the brand. Thanks