1991 ? Klein Adroit

What about the classic Backfire as seen on the cover of the 91 catalogue? If its an early one and you want to choose the right colour it makes sense, very Klein classic but different to the attractive but more common Dolomite.
Here is a link to my faded but original Backfire Attitude, it's actually brighter in the flesh, looks poor on the phone camera. Going to dig out a pic of my black Attitude too!

http://www.retrobike.co.uk/forum/viewto ... sc&start=0

Black.
 

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kleinrenzo":202r6b3s said:
mkozaczek":202r6b3s said:
kleinrenzo":202r6b3s said:
As well as the carbon fiber strips in the headset it doesn't make any sense to me why??

As to the carbon strip I imagine it had something to do with stress concentrations due to welding thin wall aluminum in the headtube. I don't think that the Adroit had a thinner headtube than the Attitude, at least there is nothing in the literature to indicate that, so why on the Adroit?? Maybe it had something to do with the fact that the height (length) of the headtube was constant from Adroit to Attitude, but the Attitude had the larger down tube and possibly larger top tube putting the welds much closer together creating a thermal stress zone.

As for the post, I imagine that they wanted to use a larger diameter seat tube but there wasn't any seatpost to fit that size on the market. That's they started making their own posts in 1992 maybe?? So, they had to adapt to the 1 1/4 tube to house the 27.2 post. I'll examine it to see ho far the 1 1/4 sleeve goes into the 1 3/8 lower section.


I would understand if they wrapped carbon around the welds but the carbon inside is ineed a mistery.
But the thinner part is a sleeve then? Sure they must have brands that made 31,6 mm seatsposts,but maybe not, i don't know.

Although this Adroit (from your website ;) ) has got the same narrow bit at the top so it could be that nobody made 31,6 mm seatposts.

adroit2.jpg

From everything I've read, another benefit of adding boron to certain elements of the frame/fork was that it reduced high frequency vibrations which supposedly add to a rider's fatigue over a long ride. In other words, reducing the vibrations improved rider comfort.
 
I'm finding this thread a real joy to read. The whole lot of information that is being exchanged is pretty cool. And Jon sure has a whole lot of information since he has to strip those frames he painted.

I have to agree the Gloss Black makes me drool... Damn!
 
I think for the time being this bike will just hang around, but I'm strongly leaning towards pearl black, like this

black1.jpg
 
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