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Old 04-05-07, 08:12 PM   #1
Hcolvin1
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Trek 400 petals

Can someone tell me if the cranks on a Trek 400 have 9/16 threaded petal holes . I am thinking about buy this bike but wish to replace the petals with a petal that has SPD cleats. I understand that there currently are two "sizes" of petal threads 1/2 and 9/16. But I don't know what the standard size was when this bike was marketed. Mid 80's I think.

Thanks
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Old 04-05-07, 08:26 PM   #2
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They are 9/16"-sized pedal threads. That's pretty much the standard on road bikes. Half-inch pedals will be on one-piece cranksets and some BMX bikes.

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Old 04-05-07, 08:27 PM   #3
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Originally Posted by Hcolvin1
Can someone tell me if the cranks on a Trek 400 have 9/16 threaded petal holes . I am thinking about buy this bike but wish to replace the petals with a petal that has SPD cleats. I understand that there currently are two "sizes" of petal threads 1/2 and 9/16. But I don't know what the standard size was when this bike was marketed. Mid 80's I think.

Thanks
If they are stock cranks, they'll be 9/16". 1/2" were predominantly on the American 1 piece cranks, and there was at least one odd sized French pedal threading. So, unless someone did something funny to the cranks, they're 9/16".

EDIT: Beat to the punch.
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Old 04-05-07, 08:31 PM   #4
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Did old cheaper road bikes with the forged one piece cranks use 1/2 I wonder, like the schwinn varsity? Not that I'll ever likely come across such a bike set up here in Canada, although CCM did produce its first 10speed road bikes in the '60s with one piece cranks, but I've yet to come across one.
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Old 04-05-07, 10:03 PM   #5
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I'd leave the petals on the plants.

What these guys said. Unless you have a French crankset (almost 0% chance of that), 9/16 is the size.
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Old 04-05-07, 11:38 PM   #6
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Originally Posted by divineAndbright
Did old cheaper road bikes with the forged one piece cranks use 1/2 I wonder, like the schwinn varsity? Not that I'll ever likely come across such a bike set up here in Canada, although CCM did produce its first 10speed road bikes in the '60s with one piece cranks, but I've yet to come across one.
Yes, all Schwinn one piece cranks I have seen are 1/2" whether balloon, middle weight or "light weight" bikes.
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Old 04-06-07, 05:24 AM   #7
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I'd leave the petals on the plants.

What these guys said. Unless you have a French crankset (almost 0% chance of that), 9/16 is the size.
I could use some petals right about now, given this faux "spring" we're having in New England.

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Old 04-06-07, 05:53 AM   #8
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Not to worry. We had a faux winter. I road all year here in Bahstan and only xc skied one day in the local woods. Horid xc ski year. Roads are dry today and its in the 40s. That's good enough!!!
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