Geometry check: Urban GT

Hope it's ok opening a thread for this, I'm about to first time order a custom Mielec (for us cheap students ;)), there is a very simple drawing I managed to pull of with a help of my girlfriend, who studies architecture (drawn in Auto CAD). Inspiration obviously GT, was working with something between the new Transeo and an old Zaskar geometry. The fork and track drop outs are a bit improvised but should just serve the purpose of showing what it should approximately end up like. It would be cool if any of you could comment or show the obvious mistakes if there are some. I'd be shopping for Ritchey WCS fork, some hub gears and then drive it fixed as soon as my knees get better :)

BB look way too high.

When you said Ritchey WCS, is that the MTB version or CX?

62cm top tube might be too long, unless that the idea reach that fit you well with flat bar.

Well, I figured out I'd want a high BB, as I always had problems with wide pedals and riding fixed.. I also think the front end will sink down (together with BB) a bit with the ritchey fork (MTB version)..

Effective top tube lenght seemed long to me as well, but its about the same measure I get between L and XL sizes of the bikes I used as models, it's also the measure I got with bike fit calculator... but will check one more time! Thanks :)

What's the drop? (axle to bb).

What's the drop? (axle to bb).

Actually, the measure in the picture is the drop.

Regarding the effective TT lenght competitive cyclist bike fit says for a MTB it is 23.4 " and stem 8-10 cm. For a road bike it suggests 56-57 which is the size I ride on my road bike and fits me well.
Maybe cut it down to 59-60 cm? I did ride 2 MTBs for a longer time but don't know what the measure was...

Thanks, edscoble!

I mean the drop from the axle of the wheel to the bb rather.

295 only give you a rough guide due to the difference in tyres, fat tyres can put it to 310mm and skinny 23mm down to 280ish.

Shortened the TT a bit, if I got you right the drop measure (rear wheel axle to BB middle) is 38 mm. Also the wheel diammeter in the drawing is about the size of 26" rims with a 2.0 tires. Hope that will do fine, still open for suggestions, also is there any other measure I should make clear so they dont fuck up the order (rear spacing I'll go for 135 mm)?

EDIT: obviously I'll have to get the fork lenght and rake right before doing anything else (should be 410 mm and 43/45/48 mm- depending on the model)

The fork looks ugly, but has the right dimensions of the 26" Ritchey WCS fork (410 mm long and 45 mm rake) and should represent the true geometry of the frame. Any commecnts/ suggestion before I order it? I want to be 100 % sure that this is good enough for Mielec to get it right. Thanks :)

Any tips? I really want to order this..

mudguard mount? rack? brake cable routing? etc.

Just gonna let them do the classic job on cable routing and mounts, what do you think about geo?

What type of headset? What kind of brake mount?

Disc mount, external I guess, don't even know if they do integrated..

I think it is an option they have. Sounds like an awesome frame, looking forward to seeing it. Are you going to put the disc mount on the seat stay or chain stay?

I wouldn't give them that cad drawing, make an account on bikecad.com and design it on there. Someone gave mielec a cad drawing similar and they struggled, for mielec you'll have to specify a few things:
Headset - intergrated or external
Welds - rough/smooth
Where you want the brake cable guides
That you want a disk brake mount
Whether you want the new or old dropouts (you want the new ;) )
Whether you want new (tapered) or old stays (you want the new ;) )
Tubing - have a look at their "custom" page and it has all your options, I'd go 35 seat tube and top tube with either an oval or 42 [i think it is, the next one up from 35 anyway] downtube

Geometry wise, help us out a bit, Stem length? Setback or no setback seatpost? Unless your about 6'5" that headtube is way too long, but yeah bikecad is the way to go, much more bike specific than standard cad and much easier to use, I have no cad experience and am pretty good on bikecad

Thanks chaps, I'll have to think this one good through.. I'll send them this drawing and try to specify other things in writting and see what they say.. If he says he's fine with that, I will OK it, if not I'll try to pull of a BikeCAD drawing. Tried using it, but with working and studying don't have the time to study it thoroughly through...

Did some basic work in BikeCAD and probably bought the fork for a good price (just have to make sure it's the right steerer lenght)!

Questions dealed with:

• Headset - intergrated
  
• Welds - smooth
  
• New drop outs
  
• New stays
  
• Disc brake mounts
  
• Tubing - I'll gor for Sirbikealots suggestions probably, thanks, man!
  
  

Open questions:

• Rear rack mounts (suggestions for a specific rake?), put them on the seat stays and maybe insert kind of a brake bridge as a mount? How to in BikeCAD? Bike may serve as a pontentional comfy tourer with drops.
  
• Bike fit check - double check my proportions and use more calculators/ different methods.
  
• Where and how to put the cable guides in BikeCAD?
  http://i.imgur.com/OuKqN7Y.png?1
  

one more problem, if I'll go for the fork I have to live with 17.2 cm steerer, to manage this, I guess I'll have to go for a zero stack headset and shorten the top tube (if I get this right, this managable just by altering the FDC/ TT angle in BikeCAD?

there's a different way to do it freddy, first up go to view>dimensions>frame then tick all the dimensions you want, among them tick effective top tube, they'll then all magically appear as you do this around the bike, you can get rid of them all and get them all back by going file>template>dimension>no dimensions>open template.

Then open the frame dimensions bit (the one you've got in that picture) and switch to "from centre distance" on the tob tube measurements, now assuming you have a 4cm stack height stem (most are or therabouts) and maybe a 1cm headset top cap, that leaves you with 122mm to play with, mielec do 120mm intergrated headtubes, luck you!

So whack in that in your headtube length box and then adjust the "from centre distance measurement" until you get the right desired top tube length, bingo bango, you have the right head tube length and top tube length.

And no problem regarding the tubing :)

For the cable stops/guides i think you're just going to have to tell mielec, i'm fairly sure bikecad pro, which you have to pay for, can do it, but not the simple version for us plebs

the way I managed to do it is defining c-c seat tube (on the top of the point/centre where the seat tube meets the top tube) and then I expanded the seat tube above --. results:

1. extended seat tube, app. 5 degree TT
   
2. sloping TT, -2.5 degree
   
   

ignore the stems and bar combo, the frame will also clear 700 wheels and looks quite ok with drop bars as well!

Basically, I can get the WCS Ritchey for 160 Euro incl postage (ridden 2 year occasionally and the guy will give me in written it hasn't been crashed or that it shows no sign of damage and similiar).
Once I order the frame and fork, I would start buying parts gradually untill the frame arives...
Thanks Ed and Sirbikealot for attention, maybe I'll be able to pay that in beer some sunny day in Croatia or Austria! :)

Seriously, lower the BB, 307mm is mindfuckingly high, especially when you considered most track frame BB drop to be around 55-60mm.

Will lower the bb to 285 mm on 26 wheels, it will still be quite high with 700c but I am okay with that!

all done! just waitting for Robert to figure out the price - seems like you pay all extra, but maybe he takes my price proposal for all together! Also stated all this in e-mail just to make sure no misunderstandigs arise.

• Headset - intergrated 12 cm
  
• Welds - smooth
  
• New drop outs
  
• New stays
  
• Disc brake mount
  
• Tubing - ST- 35, TT- 35, DT-42
  
• Color – Metallic graphitte with clearcoat
  
• 135mm dropout spacing (26“ wheels with 1.9“ tires in BikeCAD)
  
• Cable guides – 2*2 on the down side of downtube (for hub gear and break) and 1 on each down side of chain stays
  -Rack mounts – 2*2 on each seat stay
  
  
  

http://i.imgur.com/iLLNj5C.png?1