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Geometries
#1
I'm trying to get my head around some road bike geometries. How would you expect the geometry of the bike on the right to differ to the one on the left? They are nominally the same size, but what I'm interested in is whether you'd expect the rider to be more propped up, stretched out, forward on the bike etc. Is it a more aggressive geometry and if so would the differences be significant? Would it be better or worse suited to long sessions in the saddle (several hours plus)?

I have my feelings as to what to expect the differences to be, but would appreciate a more expert opinion. I also appreciate saddle position, stem, bars etc are all going to play a big part


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#2
Hmm, I think that with both of those frames you'll struggle to throw a sick whip. Have you tried a shorter stem and wider bars?

With no knowledge (me) of road bikes id definitely leave it in the safe hands of the experts of trek / specialised / giant / whoever and choose based on what they recommend for the style of riding that you want to do.

My road bike is an old specialised Allez, the old frames were ultra stiff and not too comfy, the new ones are much 'nicer' to ride in that they are not so stiff. Saying that, only yesterday I was at a bike shop here in Exeter the dude took one look at the Allez and had a mini freak out, saying it was one of the good ones from back in the day. He didn't spot the Mtb crankset I think
Keep it foolish...
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#3
The 2 things that stand out there are the head tube length measurements.

With road bikes the longer the headtube the more upright the position, most of us run spacers though so to some degree the could be moot. So the one on the left has a more upright position BUT I notice it has a very long effevtive top tube length for a 48 which will stretch you out more.

Very little help I know... demo a few and then buy something as similar as possible to the most comfortable.
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#4
Thanks

I noticed the head tube length but looking at how the downtube meets on the right compared to the left leads me to question just how much of an indicator it will be

I should clarify I own the bike on the left and eventually got it set up ok with a short stem, some spacers and the saddle forward
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#5
The stack and reach measurements are the most useful for comparing the fit between bikes. Other factors such as head and seat tube angles also obviously affect handling. If you ratio stack to reach, you can compare two bikes. The higher the value, the more "upright" the fit. The bike on the left is more upright, though the reach is longer. The bike on the left then effectively is a "larger" bike, though they share the same nominal size. The bike on the right might actually fit you better despite being more aggressive, because the reach is shorter. You've taken measures to shorten your reach. Can you get the bars to the correct height?
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#6
I knew there would be some science to apply to it. I'll take a look at some other sizes too
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