Max tire size on an 86 Trek 560 Pro Series
01-26-24, 10:16 AM
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Max tire size on an 86 Trek 560 Pro Series
I'm restoring a 560 I picked up a couple years ago. I have converted it to 9 speed and want the widest tires possible. I have some junk 24mm tires on it now and it looks like 25mm wouldn't be an issue. Does anyone know the max width? I'm using the original 600 brakes.
BTW so far, the 9 speed seems to work fine with the original friction down tube shifter and an STX derailleur I found in my parts bin.
One other huge help would be a link or product name-number of the tools I need to rebuild the bottom bracket. I might be able to work out how to get pictures of the bottom bracket if necessary.
BTW so far, the 9 speed seems to work fine with the original friction down tube shifter and an STX derailleur I found in my parts bin.
One other huge help would be a link or product name-number of the tools I need to rebuild the bottom bracket. I might be able to work out how to get pictures of the bottom bracket if necessary.
01-26-24, 11:09 AM
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I'm restoring a 560 I picked up a couple years ago. I have converted it to 9 speed and want the widest tires possible. I have some junk 24mm tires on it now and it looks like 25mm wouldn't be an issue. Does anyone know the max width? I'm using the original 600 brakes.
BTW so far, the 9 speed seems to work fine with the original friction down tube shifter and an STX derailleur I found in my parts bin.
One other huge help would be a link or product name-number of the tools I need to rebuild the bottom bracket. I might be able to work out how to get pictures of the bottom bracket if necessary.
BTW so far, the 9 speed seems to work fine with the original friction down tube shifter and an STX derailleur I found in my parts bin.
One other huge help would be a link or product name-number of the tools I need to rebuild the bottom bracket. I might be able to work out how to get pictures of the bottom bracket if necessary.
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01-26-24, 11:58 AM
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Rim width does impact tire size. While not necessarily desirable to some, a skinnier rim can make a larger tire fit in tight places.
The real rub is whether the overall inflated size (height and width) of different tire sizes ends up the same due to rim size.
If a 28mm tire on a 13mm rim vs a 25mm tire on a 22mm rim has the same clearance, does it matter?
John
The real rub is whether the overall inflated size (height and width) of different tire sizes ends up the same due to rim size.
If a 28mm tire on a 13mm rim vs a 25mm tire on a 22mm rim has the same clearance, does it matter?
John
01-26-24, 12:43 PM
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Shoot, I just sold one of these at the swap. 25s fit, but were pretty close. I THINK I recall trying on a 28 on the front, and it wouldn't quite fit.
For the BB, you'll at least need a crank puller and a BB lock ring "hook" tool (e.g. Park HCW-5). For the adjustable cup, you might need a pin spanner or some other BB cup tool. A photo would help.
Ideally you should remove the fixed cup as well. "Proper" tool for that is a flat fixed cup tool like the Park HCW-4, but there are other methods.
For the BB, you'll at least need a crank puller and a BB lock ring "hook" tool (e.g. Park HCW-5). For the adjustable cup, you might need a pin spanner or some other BB cup tool. A photo would help.
Ideally you should remove the fixed cup as well. "Proper" tool for that is a flat fixed cup tool like the Park HCW-4, but there are other methods.
01-26-24, 12:44 PM
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Also, if I recall, I had to deflate the rear tire in order to mount the wheel.
01-26-24, 01:25 PM
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Were the original rims 27"? You can usually run wider tires if you convert to 700c. Of course you may run into brake alignment issues depending on caliper adjustment slot length.
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01-26-24, 01:41 PM
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OG was 700C, and in fact, 700x20C tires.
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01-26-24, 02:30 PM
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As far as tire width, use an allen key to measure how much more room is available. Make a decision from there. Don't neglect the measurement from the bottom of the brake to the top of the tire.
01-26-24, 07:03 PM
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Thanks guys. You gave me the necessary info. I took it for a spin today even with a slightly rough BB. It's pretty freaking awesome. I've decided to not go larger than 25mm anyway. It's pretty dang smooth with the cheap 24's on it. I have several other steel bikes with wider tires. No need to make this into something slower and heavier. The 2X9 drivetrain worked pretty well. It fits me perfectly and I only have $100 in it plus my spare parts. I spent too long riding today. I'll do my best to post up some pictures tomorrow. I would like confirmation by pictures on the tools needed to rebuild the BB. I'm fairly mechanically inclined and do all my other bike work but never messed with a BB before.
01-28-24, 09:30 PM
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Switch to some Tektro 559 brakes and 38mm 650B will fit, with room for fenders if you can tolerate just a little clearance.
Trek 660 with 38mm 650b
Trek 660 with 38mm 650b
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01-28-24, 10:17 PM
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My 560 had very tight clearances. But I don't have the frame anymore, so we'll have to wait for someone w/ frame in hand and some wheels.
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01-29-24, 07:31 AM
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Sorry just saw this, on my 83 560 I manage to put 32mm gravelking tires on. It's a tight fit on the rear. Tire needs to be deflated for installation, Let me know and I'll give you details.
-R
-R
01-29-24, 11:56 AM
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^^^^ An '83 would have had the old-school rear triangle with the T R E K seat-stay caps, right? The OP's bike is later, fast-back stays, definitely spaced closer.
01-29-24, 02:21 PM
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