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Old 05-25-11, 03:03 PM   #1
Thisguy
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Question for Trek Fx Owners

Have any of you guys put on smaller tires on your fx to pick up speed? If you have... how did it perform, and what size? I will be getting one soon and am thinking of putting on 28c tires. Good Idea or bad?
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Old 05-25-11, 05:59 PM   #2
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my 2010 7.7 fx had 28c tires on it and my current 2011 7.3 has 32c. when these stock tires get worn out, im going for the 28s. the resistance to the road was much less with thinner tires and it does help with speed as well.

switching from 32c to 28c is more a question of what type of ground you're riding on. the bike path here on the west side of manhattan is very smooth and there aren't too many cracks so the 28c tires were fine. if you're riding in a place with a lot of cracks in the pavement, i'd stick to the 32s.

im looking to move to these tires in a 28c size. (700 x 28, hardcase plus)

http://store.trekbikes.com/jump.jsp?...&bShopOnline=1

fwiw.

Last edited by sh00k; 05-25-11 at 06:14 PM.
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Old 05-25-11, 06:31 PM   #3
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Originally Posted by Thisguy View Post
Have any of you guys put on smaller tires on your fx to pick up speed? If you have... how did it perform, and what size? I will be getting one soon and am thinking of putting on 28c tires. Good Idea or bad?
Lots of info here:

http://www.bikeforums.net/showthread...tires-a-thread
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Old 05-26-11, 01:05 AM   #4
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Wow it definitely does have a lot of info. Kind of blew my mind.
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Old 05-26-11, 06:41 AM   #5
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Wow it definitely does have a lot of info. Kind of blew my mind.
yeah...just because the tire is skinny and weighs less does not mean it will increase bike speed in every case.
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Old 05-26-11, 08:19 AM   #6
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One thing I will say about wider tires.. my 7.2 came with 35s. I was worried these hybrid bikes could not really handle any unpaved trails but it worked just fine for me when I had to go on some unpaved parts of a bike trail last weekend. When I was looking at the Specialized Sirrus the salespeople pretty much said it's a flat-bar road bike and unpaved trails were not a good idea. Now, I would not buy this bike if you plan to ride on trails all the time but it is nice to know that it can handle a little offroading without being uncontrollable or getting all beat up.
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Old 05-26-11, 08:40 AM   #7
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Have any of you guys put on smaller tires on your fx to pick up speed? If you have... how did it perform, and what size? I will be getting one soon and am thinking of putting on 28c tires. Good Idea or bad?
Answer:

1. You can make a meaningful comparison if, and only if, you are talking about two otherwise identical tires (same mfg/model/construction) differing only by width.

2. If (1) is the case, then you will not be 'faster' in any real sense with 28s as opposed to 32s, subject to the following qualifications.

3. You will 'feel' faster if, as you should, you run the 28s at slightly higher pressure, simply because you'll feel every imperfection in the road surface that little bit more (the 'go kart' effect -- 30 real mph 'feels' way faster in a kart than in, say, a Lexus).

4. You may, or may not, notice a very slight increase in acceleration; by definition the rotating mass of a 28 is slightly less than that of its otherwise identical 32 counterpart.

5. You may, depending on the road surfaces you ride, find the (properly inflated) 28 is actually slightly slower (more rolling resistance) over uneven surfaces than its 32 counterpart.

6. Of course, you may be capable of riding for sustained periods at speeds usually only attained by pros and elite/Cat 1 riders In that case, the tiny 'aero' advantage of 28s (over 32s) may have enormous significance for you, and be worth the slightly increased rolling resistance and slightly rougher ride.
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Old 05-26-11, 11:37 AM   #8
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I've done 3 separate off road parks & a couple 25 mile canal rides with stock 7.2 fx H2's.

The parks are all within 20 miles of my house - so I can roll in and out on the same tires I use when I get there. The mud/gravel canal is actually the recommended bike-way to get between alot of the towns around here.

I've actually had trouble finding better all-around tires & I've been reading up for awhile now. I'm very pleasantly surprised. Better mud traction would be nice, but not at the expense of road speed/cornering.

These are 35's. You'd have a hard time convincing me to let go of those extra 3-7 millimeters.

Last edited by cranky velocist; 05-26-11 at 11:45 AM.
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