Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Recreational Cyclocross and Gravelbiking This has to be the most physically intense sport ever invented. It's high speed bicycle racing on a short off road course or riding the off pavement rides on gravel like :The Dirty Kanza". We also have a dedicated Racing forum for the Cyclocross Hard Core Racers.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 05-15-12, 07:54 AM   #1
Jsiegs
Senior Member
Thread Starter
 
Join Date: Nov 2011
Bikes:
Posts: 183
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Help me choose Cyclocross bike size based on road bike size.

I tried searching - couldn't find much. Sorry if this is an often asked question.

I'm looking to get a cyclocross bike on the cheap (i.e. used) and thus don't want to waste a shops time asking fit questions and trying out stuff since I don't intend to buy there. I figure I can get into the ballpark based on my road bike size/geometry. What I'm not really sure is the cross riding position (I'm a noob to cross, looking to get started).

I currently ride a Cervelo S2, 56cm bike with a stack of 560mm and reach of 394 mm (i'm 6-1 for reference). It's very aggressive with a lot of drop for me, with a few spacers and a 110 stem. I also ride an older Bianchi steel frame in 57 (stack and reach unknown) with a 110.

I'm looking at a Specialized Tri cross in 58 that is stack of 611.7mm and reach 382mm. So it's 5 cm taller (though I use spacers on the Cervelo) and about 1 cm shorter. Should that be in the ballpark of the right size/position for me? Obviously, there is adjustability in stem length/angle and spacers.

Thanks.
Jsiegs is offline   Reply With Quote
Old 05-15-12, 09:29 AM   #2
Sawtooth
All Bikes All The Time
 
Sawtooth's Avatar
 
Join Date: Feb 2005
Location: Boise, ID
Bikes: Giant TCR 0, Lemond Zurich, Giant NRS 1, Jamis Explorer Beater/Commuter, Peugeot converted single speed
Posts: 2,343
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Although many chose to go down a size, both of my crossers are 54, just like my Tarmac. Although I do race occaisionally, I use them for a lot of things other than cross racing so I like my fit to be perhaps a bit more stretched out than your average cross racer. I tend to like my top tubes on my cross bikes to be about the same length as my road bikes. My crossers even feel a bit larger than my road bike but I am fine with that.
Sawtooth is offline   Reply With Quote
Old 05-15-12, 10:18 AM   #3
Barrettscv 
Have bike, will travel
 
Barrettscv's Avatar
 
Join Date: Feb 2006
Location: Edwardsville, Illinois
Bikes: Colnago Nuova Mexico, Eddy Merckx Corsa Extra, Pinarello Gavia, Schwinn Paramount, Motobecane Grand Record, Peugeot PX10, Serotta Nova X, Simoncini Cyclocross Special, Origin8 monstercross, Pedal Force CG2 and CX2
Posts: 10,485
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 32 Post(s)
Quote:
Originally Posted by Jsiegs View Post
I tried searching - couldn't find much. Sorry if this is an often asked question.

I'm looking to get a cyclocross bike on the cheap (i.e. used) and thus don't want to waste a shops time asking fit questions and trying out stuff since I don't intend to buy there. I figure I can get into the ballpark based on my road bike size/geometry. What I'm not really sure is the cross riding position (I'm a noob to cross, looking to get started).

I currently ride a Cervelo S2, 56cm bike with a stack of 560mm and reach of 394 mm (i'm 6-1 for reference). It's very aggressive with a lot of drop for me, with a few spacers and a 110 stem. I also ride an older Bianchi steel frame in 57 (stack and reach unknown) with a 110.

I'm looking at a Specialized Tri cross in 58 that is stack of 611.7mm and reach 382mm. So it's 5 cm taller (though I use spacers on the Cervelo) and about 1 cm shorter. Should that be in the ballpark of the right size/position for me? Obviously, there is adjustability in stem length/angle and spacers.

Thanks.
I would use reach as your best guide. I'm 6'0" and ride a 60cm size.
__________________
When I ride my bike I feel free and happy and strong. I'm liberated from the usual nonsense of day to day life. Solid, dependable, silent, my bike is my horse, my fighter jet, my island, my friend. Together we will conquer that hill and thereafter the world.
Barrettscv is offline   Reply With Quote
Old 05-15-12, 11:34 AM   #4
Sawtooth
All Bikes All The Time
 
Sawtooth's Avatar
 
Join Date: Feb 2005
Location: Boise, ID
Bikes: Giant TCR 0, Lemond Zurich, Giant NRS 1, Jamis Explorer Beater/Commuter, Peugeot converted single speed
Posts: 2,343
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Update, I just completed my 14 mile commute in to work on my JTS. I noticed that the reach on the JTS feels significantly shorter than it does on my Major Jake. The only real difference is in the handle bar. I am running an FSA pro-wing compact on my JTS and a Ritchey WCS ergo on my Major Jake. The reach to the hoods and in the drops is SIGNIFICANTLY greater with the Ritchey ergo bar. I say this because it is something to consider...even with a relatively limited frame (as long as it is within a decent range of fit), you have a lot of sizing variables for adjustment with components as well.
Sawtooth is offline   Reply With Quote
Old 05-23-12, 03:28 PM   #5
mahijiru
Junior Member
 
Join Date: Apr 2012
Bikes:
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I'll go the opposite of conventional wisdom: my roadie is smaller than my CX.

I bought my 57cm CX (Felt F1X) w/o having much of a clue about what size I was. Picked up a 56/54cm (top tube/seat tube) Cannondale R800 for a quick road bike.

Both work. Since the road bike is smaller, it feels even quicker to handle. I put a short (85mm) stem on the CX and it feels fine.

I ride almost exclusively on the tops, not on the hoods or drops. Cross-top brake levers essential for riding in traffic (Seattle). I even put 'em on the roadie.
mahijiru is offline   Reply With Quote
Old 05-30-12, 11:13 PM   #6
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Bikes: 7
Posts: 19,697
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 457 Post(s)
you building a Cross race bike or just a commuter on a cross bike platform?
fietsbob is offline   Reply With Quote
Old 05-31-12, 05:40 AM   #7
Jsiegs
Senior Member
Thread Starter
 
Join Date: Nov 2011
Bikes:
Posts: 183
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by fietsbob View Post
you building a Cross race bike or just a commuter on a cross bike platform?
I plan to race.
Jsiegs is offline   Reply With Quote
Old 05-31-12, 05:57 AM   #8
simonaway427
Senior Member
 
Join Date: Apr 2010
Location: Fredericton, NB, Canada
Bikes: 2010 S1, 2011 F75X
Posts: 1,430
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
For reference, I'm 6'0 - I ride a 56cm S1 (same geometry as your s2) with a 110 stem. I ride a 57cm Felt F75x with a 90mm stem. The reach (measured) is identical they way they are set up, but the cross bike definitely feels bigger. In retrospect, I would have been better off with a 55cm cross bike.

Tricross tends to fit big in my opinion. My first bike was a 58cm Tricross and it was way too big for me. The long chain stays make it feel even more sluggish compared to the bikes I own now. If you're looking at getting into racing, I'd looking into something a little more aggressive than Tricross.
simonaway427 is offline   Reply With Quote
Old 05-31-12, 08:22 AM   #9
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Bikes: 7
Posts: 19,697
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 457 Post(s)
Simon Burney, UK Coach to the young Pros, whose Books on the subject of cyclocross,
are in their 3rd edition,
says take off a CM from seat tube length and reach. to the bars..
fietsbob is offline   Reply With Quote
Old 06-01-12, 04:19 AM   #10
Abu Jack
Senior Member
 
Abu Jack's Avatar
 
Join Date: Oct 2009
Location: Florida
Bikes:
Posts: 86
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I bought a Motobecane Fantom Cross last year in the same size as my speciaized roubaix. It fit fine. I'm very happy with the fit.http://www.bikesdirect.com/products/...ross_ti_xi.htm
Abu Jack is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 09:52 PM.