Bike porn

part of a frame built by my dads friend Eric Doswell...

Seat lug details looks really nice, but knowing me i'd snap it off accidently with-in the 1st week

http://1.bp.blogspot.com/_9IQuGzk3veo/ScfzHd3K9qI/AAAAAAAAAG4/5cLOetSlcVU/s1600/IMG_0688-768158.JPG

looks mondrian style graphics always look awesome!

Seems like 90% of stuff is a repost these days - have we mined the internet of all porn, with only future and current builds left to fill the pages?

Good to see some old favorites cropping up again.

it looks nothing like a langster you pair of tits...
get your eyes checked.

Survey a man on the street and I bet you'll get a different opinion about just how similar they are.

I think it's just one those recurring forum jokes that some people find amusing, but actually aren't, at all.

Fuckin' tetchy bunch of blouse wearers in here.

i'm sure it's up for the task.

Look at the load path and then tell me you'd want that as a safety critical assembly on your bike. Typical brake lever ratio is about 4:1, and the standard (EN14764:2005) brake test applies 180N at the lever, so 720N of cable tension. The bean from which the cable stop is hanging is split about 3:1 in favour of loading the forward end, so about 540N is applied to the lower element of the bottle cage, the important (i.e. weak) part of which is the beam under the bottle consisting of two parallel flat steel plates of approximately 4mm x 1mm section and 40mm long, loaded in the worst possible way. I leave it to mechanical engineering students to calculate the result of loading a cantilever beam in this way, the relevant formula can be found at http://www.engineersedge.com/beam_bending/beam_bending9.htm and http://www.engineersedge.com/calculators/section_square_case_6.htm

whats hubs?????

Paire de moyeux Roval, première série fin des années 1970, 24 rayons Av et 16 rayons côté RL et 8 rayons côté ORL sur le moyeu Ar, rayons plats 1.8/2.5*1.2/1.8 mm

http://www.flickr.com/photos/30397150@N07/4225320311/

Interesting. so, it's 16 1cross drive side and 8 radial non-drive side.

Interesting. so, it's 16 1cross drive side and 8 radial non-drive side.

Similar to the latest RAR wheels, although RAR are 3-cross

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damn i like those

So do I, but EUR2400 for the 32mm clinchers means I won't be getting any soon. At least the thought of them stops me from making any intermediate upgrades from my current RS80s.

Paire de moyeux Roval, première série fin des années 1970, 24 rayons Av et 16 rayons côté RL et 8 rayons côté ORL sur le moyeu Ar, rayons plats 1.8/2.5*1.2/1.8 mm

Gay alert!

the angle of the seat tube look pretty normal, it's a track frame after all, not a BHFS frame.

i guess my issue is: head tube angle is too relaxed for a bike that boasts such a steep seat tube
just my $.02
don't have to agree with me on that

i guess my issue is: head tube angle is too relaxed for a bike that boasts such a steep seat tube
just my $.02
don't have to agree with me on that

Oh, don't you worry, he won't :-)

Doubt this caters to anyone else's taste;

gorgeous

Serious toe-overlap.

Fuckin' tetchy bunch of blouse wearers in here.

Haha :-) aren't WE just.

to ^that bike. How on earth you would be able to ride one of those on the street baffles me!

calculate the result of loading a cantilever beam

It's actually a pin jointed structure (bolt at the junction of the cantilever and the band around the stem) so it's more likely the cantilever will collapse downwards at the bolt before failure occurs .. but I can't be a*sed to sit down and work it out ..

It's actually a pin jointed structure

It's not, because the cable stop is in the middle of a rigid element, there is no pivot in the beam at that point. However, that beam is edge on and I'm not worried about it, it's the bottom of the bottle cage which is the weakest link in the structure.

By my quick and dirty calculation, a 180N brake lever pull translates into a 9mm deflection of the weak link, enough to make the brake lever bottom out against the bars before full braking can be achieved even without accounting for flex in any of the other elements.

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It's not, because the cable stop is in the middle of a rigid element, there is no pivot in the beam at that point. However, that beam is edge on and I'm not worried about it, it's the bottom of the bottle cage which is the weakest link in the structure.

By my quick and dirty calculation, a 180N brake lever pull translates into a 9mm deflection of the weak link, enough to make the brake lever bottom out against the bars before full braking can be achieved even without accounting for flex in any of the other elements.

I don't disagree (I haven't worked anything out) the forces will probably cause a plastic hinge at the bottom of the cage in the vertical and horizontal plane (twisting - the cable stop appears cantilevered off the link) but because there are bolts at either end of the link beam and clamp bands off the cage at the handle bar it is a pin jointed structure ..

to me it looks like three elements bolted together, so that's a triangle and triangles don't deform at joints. so the deflection would be in the bar in a cantilever action
I'm a designer, not an engineer though.

it is a pin jointed structure ..

It's not a pin jointed structure (at least, not the classical kind you can analyse using Bow's notation) because the beam connecting the stem to the bottle cage has a load applied to it (by the cable stop) part way along its length. The pivot's aren't frictionless either, although that's unlikely to create a material difference in the end result.

Cedywedy, it is a triangle, but one of the sides (the one from bar centre to the bottom of the bottle cage where it joins the beam holding the cable stop) can elongate if the material of the bottle cage bends.

ah yes, I saw it as a direct straight line, obviously isn't.

new S&M splined sprocket, made from steel!