I will probably get mauled by the dogs for this statement but hey ho....
It was always my understanding from the powers that be, that all the pulse range of rear ends were fabricated in chehalis, while the main triangles were manufactured at Trek in wisconsin. this was at least the case at the early part of Trek ownership of the brand name Klein.
But regardless, as pete has pointed out its a klein pulse pro.
I always found the tubing quality and welding to be pretty good to be fair, and the square into round down tube well finished, and in all honesty the frame build and quality and weight to be far better, than that offered on a similarly priced bike by another brand, (predominantly far east manufactured).
And whilst these frames were not "what we as collectors/retro riders" consider a true Klein, (in the gorgeous in your face beautiful artwork kinda of way).
It still remains a well put together frame, (bearing in mind there was only one frame for all the pulse range, just painted differently and specd according to its retail price point.)
Its a good grade of alloy handmade in the USA under Trek ownership, and with design and manufacturing imput from Gary Klein.
Merely an attempt by trek to hit the lower price points, widen the range and compete in a fierce market, whilst still being able to offer a brand name Handbuilt in the USA.
The only real achilles heel (and its really not worth mentioning now) was the paint on the original batches of pulse frames, the paint on the very earliest models, would flake off for no reason, (mainly the blue and black pulse) this of course wasnt up to either klein or indeed trek standards, and all frames with this issue were able to be replaced or refinished free of charge under the warranty provided by Trek/Klein.
FWIW IMHO, if you are looking for a well built lightweight handbuilt frame, you could do far worse than this, at least Production remained in the USA, and these aluminium frames were handbuilt.
And i can honestly say they sold by the bucketload, and i do mean by the bucketload, and i have never seen a frame failure let alone a faliure due to craftsmanship.
it could be a good buy for someone......
