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Cyclocross frame size HELP

Old 12-30-12, 10:32 AM
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Cyclocross frame size HELP

Hi all

This is the frame I would like to buy and assemble CC bike. It should not be competition race bike, but more like commuter/ recreational bike.

Problem is I cant decide what frame size to choose :

This is frame geometry I would like to buy : this is planet x frame , which has option for weight rack and mudguards ,.. which I will need sometimes when touring.

https://www.planet-x-bikes.co.uk/i/q/...clocross_frame

I am kind of in the middle between L and XL..

So this are my measures according to competitive cyclist calculator.. https://www.competitivecyclist.com/za...LCULATOR_INTRO
just enter them and you will see the results..

inseam 90.5 cm
Trunk 68 cm
Forearm 36 cm
Arm 67 cm
Thigh 63 cm
Lower Leg 59 cm
Sternal Notch 154 cm
Total Body Height 185.5 cm

Now I have road bike with this geometry size 56 https://velospec.com/components/author/a3306a4406frame with top tube 584mm

This road bike has huge height difference about 9 cm between handle bar and saddle . Position was very unconfortable and I felt too much stretched . Original stem is 11cm which I replaced with 9 cm. Of course 9 cm height difference still exists, but riding is much more comfortable. I tried 6 cm and that was too short.,.
There is no room for spacers to try lower saddle to handlebar height difference.

This CC bike I would like to build using this frame will have NO MORE than 5 cm saddle to bar difference.. ideally 3cm..

This bike calculator above suggests 56cm TOP TUBE which corresponds to L size planet X frame. but using 11cm stem.. Competitive fit is very long recreational ride unfiendly.
competitive cyclist web page suggest that French fit is much better for longer rides and for recreationalists.. but there is one thing that bothers me ..

Because there is 9 cm highet saddle to bar difference now on my bike, if I would put spacers it will AUTOMATICLY reducy REACH .. 6 cm higher BAR makes about 1-2 cm SHORTER REACH !!!
Maybe on my current bike 11 cm stem would be ok if Saddle-bar diffrence would be 3 cm for example ?

But CC bike has 3 cm longer FORK. road bike has 370 and CC 400mm fork.. So this automaticly reduces saddle to bad difference at current geometry, and makes reach identical..., but further saddle to bar hegiht difference , using spacers to rise bar make lesser reach...

So at the end maybe L planet X bike frame size would be appropriate and 11-12cm stem,.. instead XL with 9-10cm stem,.. but L bike size has only 570mm seat tube, and XL has 590 seat tube.. Now I am having 605mm seat tube, but my road bike geometry is NOT sloped (top tube is paralel to ground) so here I just put saddle tube more out.
Also head tube of L planet X frame correspodnds with my current head tube length...

Please suggestion, and advices.

P.S sorry for typos
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Old 12-30-12, 11:35 AM
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Sounds like you'd be better test riding and buying or getting something custom built if your needs are that specific.

FWIW, cyclocross bikes by definition are race bikes, maybe folks in touring and/or commuting forums would be able to help with specifics.
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Old 12-30-12, 11:49 AM
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I use my CX-bike just like you plan to use yours. I am 184 cm. and have a large Focus frame with a TT just under 56 and a 120 mm stem. I could have used one more cm TT but the XL frame is just too big for me. I like a drop seat/handlebar a bit bigger than you do so that may cause some problems. A CX frame that is too big is not going to be fun IMO,
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Old 12-30-12, 12:41 PM
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Problem is I cant decide what frame size to choose :
then go thru a bike shop so you can test ride before buying, if you are uncertain..

See if you can get an Uncut Fork/steerer (of metal, not Carbon) , then you can stack up spacers
to have the bars higher. (yes, higher is shorter reach)

Maybe you don't want a Cross bike at all , then the top tube does not need to be Level,
as You are not going to be running up hills with the bike on your shoulder..


Piles of commuter bikes with the same sort of 700cx ~35mm wide tires.. out there..

with a sloping top tube the top headset bearing sits higher than the top of the seat tube.

Last edited by fietsbob; 12-30-12 at 12:47 PM.
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Old 12-30-12, 01:57 PM
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Originally Posted by fietsbob
then go thru a bike shop so you can test ride before buying, if you are uncertain..

See if you can get an Uncut Fork/steerer (of metal, not Carbon) , then you can stack up spacers
to have the bars higher. (yes, higher is shorter reach)

Maybe you don't want a Cross bike at all , then the top tube does not need to be Level,
as You are not going to be running up hills with the bike on your shoulder..


Piles of commuter bikes with the same sort of 700cx ~35mm wide tires.. out there..

with a sloping top tube the top headset bearing sits higher than the top of the seat tube.
Of course I will order fork with uncut tube..thats the important part of custom build bike.. I will order frame and fork from planet X.. Problem is I cant sit on that bike and try it because theris store is 2000 miles away from me .. I will order (they send frames by mail)

Dont get me wrong, but I want to kep Road bike feel which I am currenty driving and get wider tyres, mudguards and weight rack option... Actually I am going to replace the frame of my current road bike..

What is better in general -. bigger frame and shorter stem.. or opposite?
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Old 12-30-12, 02:59 PM
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Originally Posted by plodderslusk
I use my CX-bike just like you plan to use yours. I am 184 cm. and have a large Focus frame with a TT just under 56 and a 120 mm stem. I could have used one more cm TT but the XL frame is just too big for me. I like a drop seat/handlebar a bit bigger than you do so that may cause some problems. A CX frame that is too big is not going to be fun IMO,
https://www.focus-bikes.com/int/en/bi...x-30-20-g.html

which of these is XL ? Can you link your bike geometry

Here are 2012 models https://www.focus-bikes.com/int/en/bi...s-ax-30-5.html

Acording to this L frame (your frame) has top tube of only 553 mm ?

Last edited by velikigrizli; 12-30-12 at 04:22 PM.
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Old 12-30-12, 05:55 PM
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I have the Large with a TT of 553 mm and as I said it could have been one more cm . A friend has the XL and that bike is just too big for me. On the whole I would go for the smaller of two sizes if you are in between with a longer stem.
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Old 12-31-12, 12:52 AM
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Originally Posted by plodderslusk
I have the Large with a TT of 553 mm and as I said it could have been one more cm . A friend has the XL and that bike is just too big for me. On the whole I would go for the smaller of two sizes if you are in between with a longer stem.
You replaced original 11cm stem for 12 cm stem to get apropriate reach ?
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Old 12-31-12, 02:56 AM
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Yes
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Old 12-31-12, 08:38 AM
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Originally Posted by plodderslusk
Yes
What about XL and 10 cm stem ? it gives identical reach ?
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