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Sizing for a new Trek(10 posts)

Sizing for a new Trekwoofers
Jan 8, 2004 8:11 PM
I'm buying a new road bike this weekend, and have settled on the Trek 1500. From my inseam (78.5) and based on my old bike's measurements I would fit on both the 50 and 52cm frames as they have the same top tube length.

Should I opt for the 50 or 52cm size frame?
re: Sizing for a new Trekone_speed
Jan 9, 2004 6:57 AM
it's a tough call. normally, i'd go for the top tube measurement. how is the standover? you should stand over the bike and pull it up evenly from front and back until it hits your crotch. then, have someone see how much room there is between the tires and floor. i'd be sure there is at least 3-4 cm. (1-1.5") also, you should have at least ~8 cm (3") of seat post showing. you'll have more agressive handling if the top of the bars are a little below the height of the seat. i'd recommend that if you're going to be racing. best of luck!!
re: Sizing for a new TrekChen2
Jan 9, 2004 7:19 AM
I think you should make your decision based on the drop from saddle to handlebar. Trek's geometry tends to cause a lot of drop.
head tube length....C-40
Jan 9, 2004 7:34 AM
The frame that will provide the desired handlebar height, without a big stack of spacers or a high rise stem would be the best choice.

The 52cm has a 75.5cm standover, which should provide adequate clearance, if the stated inseam measurement is accurate.
Yep, that's what I think too. (nm)Chen2
Jan 9, 2004 9:11 AM
re: Sizing for a new TrekNEIL
Jan 9, 2004 7:37 AM
If the top tubes are the same on both of the sizes, and you fall right in the middle, I'd go with the 50cm. Half an inch more seatpost won't hurt anything and generally a smaller frame will have a lower center of gravity and handle a little better. Also double check the actual seat tube length, center to top of tube, trek's sizing can be screwy since they measure to the top of the seat tube collar on some frames. I wish they wouldn't do that, it just makes things needlessly confusing.
re: Sizing for a new Trekcollectorvelo
Jan 9, 2004 9:08 AM
The taller the bike; the more comfortable it will be
get the 52cm
how do you figure?one_speed
Jan 9, 2004 12:46 PM
i've had my share of bikes over the years and have helped others get fitted, etc. i've never heard this one. can you explain?
how do you figure?collectorvelo
Jan 10, 2004 3:32 AM
with today's aheadset systems
it is difficult to change height of bars
and most casual (not racer) riders prefer bars not too far below saddle
so taller frames are generally more comfortable

plus the older you get (assuming you keep your bike)
the less your lower back likes you leaning over
how do you figure?one_speed
Jan 10, 2004 2:07 PM
thanks for the reply. i don't really agree with that as a rule of thumb. many opt for the smaller frame as it allows for an easier dismount at intersections, etc.

i do see what your saying, but with all the options available in stems/spacers/etc, it's pretty easy to fit a frame that may be correct in length but a mere centimeter shorter than idea.

i still would opt for the smaller size, but realize everyone likes their bikes a certain way. the best option would be to spend a little time with the bikes before buying, i think we can all agree on that.

have a good weekend!