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Max Tire Size for Giant Defy 2

Old 01-07-14, 03:10 AM
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tusker
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Max Tire Size for Giant Defy 2

Thx guys for your help everytime.Question is will the Defy 2 take bigger sized tires?The bikes comes with 700x25c.What max size will it take? 700x32 or less.Are the 700x 25c good tires for doing 100km a day on tour?
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Old 01-07-14, 08:28 AM
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1. That bike has caliper brakes. As a general rule 28 mm is the widest tire that you will be able squeeze between the brake pads. Even at that, depending on frame clearances, tires that size might not work.

2. Just what do you mean by touring? If you are planning to ride 100 km per day over reasonably paved roads while somebody else schleps your stuff, 25 mm tires will serve you well. If you're planning to pack 40 lbs of stuff on your bike, you'll probably want a bike that has wider tires and a longer wheelbase to maintain a more stable front-to-back weight distribution.
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Old 01-07-14, 05:28 PM
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Assuming they haven't changed the frameset that much from my '09,32's might fit depending on the exact model of tire(they're not all exactly 32mm wide,and the actual width changes depending on the width of the rim they're mounted on). I've got 28's on mine and there's a touch of space left.

Originally Posted by Retro Grouch View Post
2. Just what do you mean by touring? If you are planning to ride 100 km per day over reasonably paved roads while somebody else schleps your stuff, 25 mm tires will serve you well. If you're planning to pack 40 lbs of stuff on your bike, you'll probably want a bike that has wider tires and a longer wheelbase to maintain a more stable front-to-back weight distribution.
This. Defys are more for performance than hauling stuff.
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Old 01-07-14, 08:20 PM
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N+1 time another bike made around wider tire capacity is in order ..


Racers think 28 is a fat tire..anyhow..
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Old 01-08-14, 05:01 AM
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Thanks for the input guys.I was hoping to use the bike on light touring then a 1200 km trip in August.Gear Load to carry I estimate to be around 20 to 25 pounds plus.The bike is just within my budget range and I was hoping it would fit more than 28s.Well..
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Old 08-01-16, 01:14 PM
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Originally Posted by dynaryder View Post
Assuming they haven't changed the frameset that much from my '09... I've got 28's on mine and there's a touch of space left.
What 28 mm tires are/were you using on your Defy? Is there any chance that you did or could measure them to see if they fit because they were under spec'd by their maker?

I've tried three tires so far in my effort to find wider tires for my 2009 Defy. A 32 mm (a Performance Bike tire, but I forget which) didn't come even close to clearing the brake arch (Tektro R530) either front or rear. The 700x28 Performance Strada ST Road wire beaded, non-folding tire measured only 25 mm in width after mounting it on my 15c rim so they're getting returned. The Goodyear/Kent 700x28 folding road tire [1] measures 28 mm wide and 28 mm high and fits on front with a millimeter or two to spare, but just barely doesn't clear the brake arch in the rear. (It's so close that I'm tempted to try shaving it.)

It seems like the only way to fit a wider tire is a lot of trial and error to find a 25 mm tire that runs wide (like the Conti GP 4000s II [2]) or a 28 mm tire that is thin skinned on top.

Note:The Bicycle Rolling Resistance site includes actual mounted width and height measurements in their reviews, but they use a 17c rim so you will probably have to extrapolate a little from their results.

[1] This tire actually seems to be a decent inexpensive tire. It's head and shoulders above the cheap, stiff, heavy tires that you usually find at department or hardware stores. If your LBS is closed or you're stuck in the middle of nowhere you can find them at Walmart for only $21. You won't go racing on them, but they're good enough for local group rides—even with the fast group.

[2] Continental Grand Prix 4000s II 25 mm: 27 mm wide x 25 high, 28 mm: 31 mm wide x 29 mm high.

Last edited by pjrobar; 08-01-16 at 01:18 PM.
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