Bike Anti-Porn - When Things Go Wrong

I'm sure it rides fantastically and was designed by someone who knew what they were doing, it just look horrible.

Is the geo chart about yet?

Headangle seems slacker than usual for track. On the other hand...does that mean perse it rides Foffa?

that should fold nicely on first skid.

Headangle seems slacker than usual for track. On the other hand...does that mean perse it rides Foffa?

It does look slack but that seems to be the direction things are going, just look at the latest BMC track bike, it's probably more aero to not have stupidly tight frames and forks.

Also note the bend in the DT, if it was straight the wheel would be a bit closer to it.

By the head tube? Thats just a bit of dirty hydroforming of the DT, surely?

Isn't is pretty much a CAAD10 with track ends?

... and messed up geo!

Co-Motion also build tandems with no diagonal tube. Pretty sure somebody there has a calculator and a book of engineering formulae :-)

I've always wondered how Alex Singer got away with no diagonal tubes on his tandems:

It cannot be just the tiny triple triangle at the back right?

He was one of the best tandem builders in the 40s and 50s, and laws of physics where the same then, so probably he knew what he was doing...

I feel bad I have shown a Singer in the AntiPorn thread, but I had to illustrate my question...

(I also always wondered about his tandems why he didn't have the drive chain from the rear chainring directly, like on a lot of tandems... Jack Taylor tandems have that detail too...)

Rene Herse and Jack Taylor from the top of my head were also the best tandem builder at the time too, something about using larger diameter tubing in lieu of standard that most tandem builder use at the time.

(I also always wondered about his tandems why he didn't have the drive chain from the rear chainring directly, like on a lot of tandems... Jack Taylor tandems have that detail too...)

You know why, just look for the front shift lever.

You know why, just look for the front shift lever.

I see what you mean but I've seen that on later tandems where front derailleur was cable operated and could have been installed at the back... I can check my AS book, I'm sure they are some like this.

Well actually a quick google search shows one from 1949 where derailleur could have been at the back, unless I miss something...

Dammit, another AS in anti-porn, I will crash with my bike for blasphemy...!

This one has diagonal tubes...

It does look slack but that seems to be the direction things are going, just look at the latest BMC track bike, it's probably more aero to not have stupidly tight frames and forks.

Also note the bend in the DT, if it was straight the wheel would be a bit closer to it.

That means my 98 Gazelle (not as slack as this but not tight as ducks arse either) is now a trend setter. See, everything comes back into fashion :P

But I am not sure rightaway what's wrong with the geo...any pointers welcome as I like learning about frames, how they work, why such angles/clearances etc... :)

Nothing is wrong I just personally don't like how very slangy head tubes or a large gap between the DT and front wheel looks.

You gazelle will be quite slack because it's a small frame and therefor will have a less steep HT angle than it would in a larger size, they do this to avoid massive toe overlap and reduce reach a little I think, I'm not sure what the reason for doing it on that cannon dale is though, probably for better aeros or something.

Posting this because it illustrates my point about steep angles and because the build is ugly.

http://static.lfgss.com/attachments/86344d1404037286-img_20140629_103754.jpg

Still less slack than the Cannondale.

Hot Pendle frame is hot, too much red/blue atm though :)

I'm sure it rides fantastically and was designed by someone who knew what they were doing, it just look horrible.

Is the geo chart about yet?

This thing wasn't designed at all, just stick track ends on already designed road frames...

Like some Langster models then ;)

Yes.

There you go

.

(I also always wondered about his tandems why he didn't have the drive chain from the rear chainring directly, like on a lot of tandems... Jack Taylor tandems have that detail too...)

shifting under power (especially with rudimentary '40s dérailleur) is better with longer chain, most noticeable on a tandem where it's very tricky to synchronise easing up on the pedals to change gear.

unfortunately this one benefit is a bit outweighed by the 4-foot chain dancing about like a motherfucker every time you shift/hit a pothole

^^ TBH my TCR has quite a gap behind front wheel. I think it must be wind tunnel results. No other reason for it?

There you go

You can park a van between the front wheel gap. Well. As long as there's a technical reason for it.

tight gap doesn't equal moar aero, like those extra wide fork big enough for a 3" fat bike tyre.

Yah maybe clearance of rotating airflow or some such. Anyho they all doing it.

I've been tempted to post Alice's new bike ever since she got it, but I've stumbled upon something much, much, worse.

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