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Track Geometry Fixies(12 posts)

Track Geometry Fixiesbikemike
Dec 23, 2002 6:01 AM
Hey all,

I just got a track bike which I'm going to rig up into a fixed gear road bike. Now I know it would be the wrong geometry for this sort of thing but does anyone have any experience with tweaking their position on a track bike? I can't get my position anywhere near my road position and the prospect of riding on the road in my track position will drive me batty.

In case you were wondering I race track as well - hence the track geometry. I don't have too much cash so the purchase of a road geometry fixie is just not justified...ah well.

thanks
mike
re: Track Geometry FixiesSteve_0
Dec 23, 2002 6:44 AM
I've never done this, so take it for what it's worth....use your current road bike as the basis...

try to emulate your road geometry by measuring the seat back from plumb to the BB. Buy a post with the necessary setback to accomplish this. Duplicate the BB-to-saddle distance to ensure proper saddle height.

Then tweak the stem height/length to emulate your road reach as closely as possible.

You're obviously going to be making tradeoffs in doing this...but it's a start.

i'd be interested in knowing how close you come.
Seat postRon in NorCal
Dec 23, 2002 9:12 AM
Some triathletes use a forward seat post to get an effective steeper seat tube angle on a road bike. Maybe flipping it around you can acheive a slacker (pun intended) seat tube angle. That coupled with your saddle all the way back on the rails should get you closer to your road bike geometry.

Something like this.
Doesn't work....TFerguson
Dec 23, 2002 9:17 AM
I e-mailed the company and asked if I could turn one of their posts around. Said that the seat angle does not have enough adjustment to get the saddle level.
TF
Lookmarron
Dec 23, 2002 9:41 AM
Having been down this path myself I can tell you that that the only seatposts that offer enough setback to overcome the steep angles on a track frame are the carbon Ergo posts from Look.
Save big $$$Steve_0
Dec 23, 2002 10:02 AM
look into Easton MTBs, Titec's Hellbent, or Gilles Berthoud. All provide generous setback at about 1/3rd the price.
re: Track Geometry Fixiesfixedgearhead
Dec 23, 2002 10:16 AM
One thing that is going to be different is the BB measurement. The true track bike BB hight is higher off the ground than a similar road frame; thereby making the BB/top tube measurement different for the same size bike. I have a 55cm Cinelli track bike and a 55 cm Cinelli super corsa road bike both same vintage. The bb/ to top tube measurement is different even though they are both 55cm. It is not going to be as easy as just a seatpost swap. Just take all those things into concideration when you are measuring things out. I had to play with crank length ,handle bar extention and saddle position, before I was able to get things close enough to be virtually unnoticable. Good luck.

fixedgearhead
How much difference in standover?Dave Hickey
Dec 23, 2002 10:30 AM
I've been looking a the Cinelli track frame for yet another project. If I ride a 52cm Super Corsa, should I go with a 50 or 51 track?
How much difference in standover?fixedgearhead
Dec 23, 2002 5:20 PM
Dave, I am sorry that I can't answer that right now. The Super Corsa is at the builder being converted and repainted. It won't be back for a month or so. I seem to remember that it was close to 1" but don't hold me to that. It was over 2 years ago that I did the set up and the mind is a terrible thing to waste. Not unlike the waist, which is a terrible thing to mind. I do know that I went with 170 length cranks on the track bike and 165 on the road bike. I still had the same ground clearance on the track bike cranks that I did on the road bike for cornering. I don't ride the track bike on the velodrome as there aren't any around here so that allowed me to use the longer cranks. That would make the measurement about 5cm at the least. What with the steaper seat angle there are probably a few more cm there lurking somewhere. If you can wait till I get them back I will measure them and let you know. I can measure them against a 55 Bianchi but that might be apples and oranges.

fixedgearhead
How much difference in standover?Dave Hickey
Dec 24, 2002 4:36 AM
Thanks, I can wait. The Cinelli is just one of many projects.
Don't hold me to itTig
Dec 24, 2002 9:07 AM
When first renting a track bike from the velodrome I remember being told to choose a bike that was 1 to 1.5 cm smaller than my road bike (to keep the same stand over height and basic size).

You could call the Alkek Velodrome office at 281-578-0693 or email Kathy Volski at Alkekvelodrome@cs.com for advice. I don't have any contacts with the Frisco Superdrome. I'm sure an email to Sheldon Brown could get a solid response as well.
Thanks Tig. Merry X-mas.........nmDave Hickey
Dec 24, 2002 9:47 AM