Bike porn

Orly?

unfinished but i really want a merlin frame

Half built weight weenie? Meh

With a thomson, ti frame and high spoke count kinda half arsed weight weenie

either way i love it. what year is that carbon record from? always loved it.

With a thomson, ti frame and high spoke count kinda reliable and durable weight weenie

fixed.

Yeah, alright Eingang, that Pelizzoli is a ton load nicer than the first one.

Wonder how long I'd have to save up to be able to afford one of those frames...

Alu tends to flex less but is more brittle.

Steel is stiffer than aluminium

... and steel frames flex a lot more than alu frames

Steel is stiffer than aluminium

If you compare like with like (i.e the same shaped objects) the steel one will always be about 3 times stiffer than the aluminium one. Fortunately, aluminium is about 1/3 of the density of steel, so you can use three time as much of it. It's where you add that extra material that makes aluminium the first choice for light and stiff structures where overall dimensions are unconstrained. The first modern aluminium frames (Alan, Vitus 979) added material inside the tubes (keeping the same OD but increasing wall thickness), throwing away the advantage and ending up less stiff than steel frames. Only by spreading the extra material out further from the tube axis did the likes of Klein and Cannondale make aluminium frames both stiffer and lighter than contemporary steel frames. The same goes for stems - quill stems are constrained to have a shaft OD of 22.2mm for 1" forks, so steel will be stiffer because of it's higher sectional modulus. By removing the dimensional constraint, aluminium ahead stems are stiffer per weight than steel because the low density material can be made into large sections.

Ah that's it. I got a little fuddled.

You need more alu than steel to make an equally stiff frame. Removing slightly from the weight advantage. This said (as you say) - A well designed structure can lighter than a structure designed as you would in steel

shite

Orly?

You know what I mean.

Plus, the car in the example is around 50 years old and things have moved on just a bit...

This mixmatch pelizzoli is pretty nice...

wrong thread

That shouldn't look awesome but it does

Fixed

Nice. I can't believe how many photos are taken in the small ring though, takes about a second to fix!

wrong thread

True, but the frame iz butterz.
nearly bought it a couple of years ago from the
(then) owner... I'm glad i didn't somehow.

what a chain ring

122km/h record ;p

I bet that helmet offered some serious peace of mind at those speeds.

The guy must be rolling like a boss ;d