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Old 08-10-07, 07:59 AM   #1
chrisch
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Tire Sizing Trek 520

Hi everyone!

After completing a few tours this summer with my new '07 Trek 520, I'm giving thought to changing the tires to something with a better profile. Many here have recommended the Schwalbe Marathon Plus tire, but I'd like to better understand tire sizing before buying anything.

I understand it's possible to replace the existing 700x32C Bontrangers with 700x32C, 700x35C, or even 700x38C(??) Schwalbes. That's fine and all, but is there an optimal choice, or does it come down to preference? If it is preference, how will the different sizes affect my ride?

Thanks in advance! chris
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Old 08-10-07, 09:55 AM   #2
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Wider tires=More Comfort for you. They soak up bumps in the road better and you don't feel as beaten up by the bike as you do with skinnier tires.

Wider tires are also slower moving than skinnier ones, but if you're doing loaded touring, the speed difference really doesn't matter.
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Old 08-10-07, 04:19 PM   #3
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Originally Posted by fat_bike_nut View Post
Wider tires=More Comfort for you. They soak up bumps in the road better and you don't feel as beaten up by the bike as you do with skinnier tires.

Wider tires are also slower moving than skinnier ones, but if you're doing loaded touring, the speed difference really doesn't matter.
Hi fat_bike_nut, I think what confused me is the second number in the sizing. I realize it's the spacing between the beads, but only considered how well the tire would fit, and not how wide the tread would be. I think it makes sense now. Thanks.
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Old 08-10-07, 04:30 PM   #4
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i'm biased in favor of the wider tires,
a regular 37-622 Schwalbe marathon is a good choice.
it's suggested max air pressure is 85 psi vs. 95 psi for the 32-622 size.
IMO, the rolling resistance lost by decreased air pressure is only gained
back by the slightly wider and narrow tire contact area. only speed loss
is probably due to slightly slower acceleration of the heavier 37 mm size.
plus there is a comfort gain that is hard to project, after a few hours on
the road; lower transmitted shock is a nice benefit. the fatter tire is
also less subject to flats from tracks, pot holes and other pavement suprises.
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Old 08-10-07, 04:36 PM   #5
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How did those bontragers work out for you? I just put mine back on, I haven't ridden them yet.

I used the Conti Top Touring (may they rest in peace) and loved them, for most of my road touring. I also used the Conti Travel Contacts on my australia tour, b/c they have some side-knobs, and I wanted that for additional traction on gravel roads. I found them to be a bit on the heavy/slow side, but they performed fine.
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Old 08-10-07, 10:17 PM   #6
Michel Gagnon
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I have year model 2000, which had a threaded headset (i.e. slightly different fork), but I believe the recent Treks 520s have about the same characteristics. If that's so:
- you won't have problems using a 700x37 tire, maybe even a 700x42 tire on the rear wheel;
- a 700x35-36 is about the largest size that fits on the front wheel if you use fenders. I once tried a Continental Top Touring 700x37 in front; the wheel could spin, but barely.
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Old 08-11-07, 03:43 AM   #7
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How did those bontragers work out for you? I just put mine back on, I haven't ridden them yet.
I like them, although I have little to compare them to. My tours this summer were mostly on paved surfaces, which is fine for the Bontragers. A better profile would have been nice on some of the unpaved roads and paths. I'm thinking of a tour in Iceland some year, and I'll definitely need something more rugged for that. Perhaps even a bike with suspension?

Let me know when you get out with the Bontragers. I'm curious what you think of them in comparison to the other tires you've used.
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Old 08-13-07, 02:17 PM   #8
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Here is the thread on my Trek 520 with a picture of 700x38c Kenda Kwest tires and fenders mounted.

They ride just fine. I will most likely be dropping to 700x28 or 700x32 tires though just to see what the difference feels like.
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Old 08-15-07, 07:17 AM   #9
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I put these on this spring. just now at the 400 mile mark (414 to be exact). They seem like good tires for less than $10. no loaded touring yet but I weigh around 240#. I still have the 32 racelites on the front

http://www.performancebike.com/shop/...tegory_ID=5420

a friend rides a trek 1000 and saw mine so he got a set similar but in a 28. He says they are better than the racelites that came on his trek. I dont know if I'd go that far but they are god for the price.

http://www.performancebike.com/shop/...tegory_ID=5420
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Old 08-15-07, 07:41 AM   #10
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It's strictly a matter of personal preference. If you are comfort oriented, wider is better, and if you are performance oriented, narrower is better. Somewhere in between is where you want to be. But if you want my opinion, there's no advantage whatsoever in going wider than what you need for your weight.
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Old 08-15-07, 07:56 AM   #11
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It's strictly a matter of personal preference. If you are comfort oriented, wider is better, and if you are performance oriented, narrower is better. Somewhere in between is where you want to be. But if you want my opinion, there's no advantage whatsoever in going wider than what you need for your weight.
one advantage to wider...you won't need to air up as often. I ride 2 bikes (depending on mood). One (the OCR3) has 26.5s and I have to air it up after 2 or three days. The 32 front and 35 rear on my 520 will go a week without needing air.
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Old 08-15-07, 08:01 AM   #12
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Wider is better in the dirt.
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