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Trek 1200C Question About Tire Width

Old 10-21-17, 08:05 AM
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ALSMITH90
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Trek 1200C Question About Tire Width

I have a Trek 1200C bike frame and need to know if it will accommodate 700x40mm tire mounted on OEM Alex AT450 Rims. Can someone help me on this?
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Old 10-21-17, 11:17 AM
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Do they not have the ISO number of the rim size in tiny letters somewhere on the rim. Probably next to the AT450. But in really tiny letters. Without the specs on the rim I wouldn't begin to say yay or nay.

As for will they fit on the frame? What's on it now? 25mm? 40 minus 25 is 15. half of 15 is 7.5.

If the 40 has a smooth street tread, then you can check to see if you have 7.5 mm plus what ever you feel a safe gap between the sidewalls and tread of your current tire to the frame and components. The 40mm tire is probably going to have knobby tread, so you'll have to guess how many more mm to add for them.

It's not exact, but it'll get you a better idea than completely guessing. Unless someone knows for sure.
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Old 10-21-17, 02:37 PM
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Won't fit... 1200's are close fitting race frames.

you'll find that 32's barely clear the brakes, and may in fact rub them.... at least that's what i ran into on one i had here...

and then... there is your post about the skinny rims... dude... 40's won't fit the rims either.
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Old 10-21-17, 02:46 PM
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Agreed, good tire choice but on the wrong bike. Like putting monster truck tires on your base model F-150 pick up. Andy.
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Old 10-21-17, 02:59 PM
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Originally Posted by Andrew R Stewart View Post
Agreed, good tire choice but on the wrong bike. Like putting monster truck tires on your base model F-150 pick up. Andy.
more like a Chevy Cosworth Vega.... or a maverick grabber... ;-)


Last edited by maddog34; 10-21-17 at 03:13 PM.
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Old 10-22-17, 07:57 PM
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Small print on rim label

Originally Posted by Iride01 View Post
Do they not have the ISO number of the rim size in tiny letters somewhere on the rim. Probably next to the AT450. But in really tiny letters. Without the specs on the rim I wouldn't begin to say yay or nay.

As for will they fit on the frame? What's on it now? 25mm? 40 minus 25 is 15. half of 15 is 7.5.

If the 40 has a smooth street tread, then you can check to see if you have 7.5 mm plus what ever you feel a safe gap between the sidewalls and tread of your current tire to the frame and components. The 40mm tire is probably going to have knobby tread, so you'll have to guess how many more mm to add for them.

It's not exact, but it'll get you a better idea than completely guessing. Unless someone knows for sure.

Thanks for your input on original question. I took a look at the rim label and it reads Alex AT450 in small print it reads 622x14. Would the second number “14” be the rim’s inside dimension ?
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Old 10-22-17, 09:59 PM
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Originally Posted by ALSMITH90 View Post
Thanks for your input on original question. I took a look at the rim label and it reads Alex AT450 in small print it reads 622x14. Would the second number “14” be the rim’s inside dimension ?
yep. narrow rim for a narrow frame.
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Old 10-29-17, 06:48 PM
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Originally Posted by maddog34 View Post
Won't fit... 1200's are close fitting race frames.

you'll find that 32's barely clear the brakes, and may in fact rub them.... at least that's what i ran into on one i had here...

and then... there is your post about the skinny rims... dude... 40's won't fit the rims either.
Thanks for your opinion. I took a shot at mounting a 700x35. No can do! It cleared side to side, but rubbed upper section of the brake calipers. Again, thanks.
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Old 10-30-17, 08:18 AM
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Originally Posted by ALSMITH90 View Post
Thanks for your opinion. I took a shot at mounting a 700x35. No can do! It cleared side to side, but rubbed upper section of the brake calipers. Again, thanks.
I have a 1200 from the early 00's that I use for chasing my kids around the park. Same Alex wheels, biggest tyre I've run on them is 28's. Might be able to do 30's but the other problem that I've run into with those narrow rims is getting the brakes to open wide enough to get the wheel out, but still have enough braking force when closed.
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