critique my frame geometry (drawing inside)
 

Hey everyone,

Some time ago I asked for some advice on the geometry of my new road fixed gear bicycle on this forum, heres the thread -->

http://www.bikeforums.net/showthread...light=geometry

.. I now finished the design of the geometry and made a drawing of it, heres a link -->

http://imageshack.us/photo/my-images/824/frame13.png
http://imageshack.us/photo/my-images/824/frame13.png


All of you frame geo pros, please have a look at it, critique?


To sum it up again, here is what I want this bicycle to feel and ride like :
Its is mostly going to be ridden around town, used on roads, I might take it to our local velodrome, too, but yeah its mostly going to be for road use.

Still, from the feel and how it rides, reacts; I want this fixed gear bicycle to be like a track bike, or very similar to it: a fast racing geometry, agile, twitchy, sprints

So my plan was to keep the most important aspects of track geo (steep ht angle, high bb, short wheelbase), but adjust it a little to make it more suitable for road and town use.

So yeah, do you guys think my design is going to ride and feel the way I planned and want it to? If not, what would you change?

Thanks a lot for all responses and information!

Cheers,

Fabian

I'm sure as hell not a "frame geo pro" and I'm not sure there is such a person who can look at (that) drawing and tell you if that bike will achieve your goals, for you. It certainly looks like you have all the elements to get there, but each bike is individual and will feel different for different folks. My view is to build it and ride it. It's the only way you'll know.

I'm also not a pro frame builder, but have a few under my belt. My first frame was designed around a known geometry and fit that suited me well. I built it because I was considering a custom steel frame with a few extra bells and whistles. Custom frame costs scared me off, so being fairly handy with metal forming and joinery, as well as having been a decent welder, and a big fan of DIY, I decided to jump in and build my own. I'm glad I did, because I now have a new hobby, in spite of it being a fairly expensive one. It would have been way cheaper to have someone build that first custom bike- but I'd only have one!

The subsequent frame builds have been an adaptation of the first one, with changes here and there trying to achieve a different goal, and learning first hand how these changes affect handling, rideability, and fun.

Sorry for the long way around to my suggestions- especially if you're building it yourself, just do it. Ride it, and if you think a change might suit you better, build another. You can build a frame and fork using high quality frame building supplies for under $300. I can think of worse ways to spend the time and the money. It's pretty cheap fun!

Looks good. I don't know anything about you or your riding style so I can't really comment on your tt length, seat tube angle, etc. But coincidentally enough, the dimensions on your drawing are almost exactly what I used for a fixed I built 7-8 years ago. The only real difference was my fork had about a 50mm rake, so less trail and quicker/"twitchier" steering than your bike will have.
I used my bike for a couple years worth of daily commuting with quite a few longer rides/centuries and loved it.
I'm 6' 2" 190 for reference.

Have fun and post some pics when you're done!

hmmm

Hey cool man =) .. The top tube, seat tube length, etc. are desigend so the frame will be large enough for me.. I went to a custom bicycle shop who was a measurement system for that, and they measured me and suggested tt, st length.. I then integrated these lengths in my design to have a bicycle which will fit me nicely =) .. Seems to be about right cause im 6'3'', so my bike should be about the same size as yours =)

thanks for your answers guys =)

..