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Need help choosing a good tire and figuring out if I have 700C wheels or 27"

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Need help choosing a good tire and figuring out if I have 700C wheels or 27"

Old 07-04-14, 10:31 AM
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tubiflex
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Need help choosing a good tire and figuring out if I have 700C wheels or 27"

I'm currently learning about bikes and would appreciate a bit of help.

I picked up an old 1974 Peugot PA10E and I'm looking at replacing the tires. I have no idea if they are 27" tires or 700c.

I browsed through the old flyer's and it shows the wheels as being 27". Looking at the current tires installed they are [Gommitalia Champion]. Amazon shows these as being 700c.

Also will any 27 1.4 or 1.8 tire fit a 27" inch wheel?

Thank you
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Old 07-04-14, 10:33 AM
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The size of the tire should be there somewhere on the sidewall.
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Old 07-04-14, 10:41 AM
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I would agree with you but in this case the marking have all faded. The bike was unfortunately left outside last winter the wheels are a greenish color.
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Old 07-04-14, 10:47 AM
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Originally Posted by tubiflex View Post
I'm currently learning about bikes and would appreciate a bit of help.

I picked up an old 1974 Peugot PA10E and I'm looking at replacing the tires. I have no idea if they are 27" tires or 700c.

I browsed through the old flyer's and it shows the wheels as being 27". Looking at the current tires installed they are [Gommitalia Champion]. Amazon shows these as being 700c.

Also will any 27 1.4 or 1.8 tire fit a 27" inch wheel?

Thank you
The old literature probably means the bike was supplied with 27" by Peugeot when it was new. Anything could have happened over the last 30+ years.

Try to read all the markings on the tire. 700 = 700c, 622 = 700c, 27" = 27", and 630 = 27." Also read all the markings on the rim - the same codebreaker should apply.

The only question then is do you have a hooked bead (which means you can use modern tires at their rated pressures) or not (which means you can only use older tires rated for about 70 psi max.

One more constraint is rim inner width versus tire width spec. The rim inner width should be not much more than 12 mm smaller than the tire width, though the consequences of violating this are not usually dire.
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Old 07-04-14, 10:49 AM
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Sew-up tires?

Originally Posted by tubiflex View Post
I would agree with you but in this case the marking have all faded. The bike was unfortunately left outside last winter the wheels are a greenish color.
Maybe your bike has sew-up tires instead of clinchers.
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Old 07-04-14, 10:55 AM
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Are you able to measure to 1/16 of an inch or to the millimeter? If so you can measure the actual rim diameter, pretty well. That will tell you for sure.

To read what the rim and tire say, you might need to wash them.
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Old 07-04-14, 11:21 AM
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I'm unable to measure the diameter. Here a few pictures that may help

There are no other markings on the tires other than Made in Thailand 05.



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Old 07-04-14, 11:51 AM
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I agree they certainly look like tubulars. A tubular tire, also referred to as a 'sew up' is a type of tire that needs to be glued onto the rim. They used to be quite popular for all riding but in the last two decades are mostly used for racing.

I don'tthink the rims are greenish from the elements but that is the color of hard anodizing that was used on them.

I don't know much about Peugeots but that looks fairly nice.

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Old 07-04-14, 11:54 AM
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Thank you for the insight everyone and the history lesson. I'll bring them over to my LBS.
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Old 07-04-14, 04:27 PM
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gommitalia champions are 700c tubulars.

i would change the rims to 700c clinchers to avoid all the gluing headaches, but many people run tubulars and find them lightweight and even safer than clinchers (for the unlikely event of a high speed blowout).
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Old 07-04-14, 06:55 PM
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Tubulars and tight gearing (52-45/14-21) were standard on the PA-10, PR-10, and PX-10 in the early 1970s. The PA-10 was considered an entry level racer.
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Old 07-04-14, 07:36 PM
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Originally Posted by tubiflex View Post
I'm unable to measure the diameter. Here a few pictures that may help

There are no other markings on the tires other than Made in Thailand 05.



You have decent but cheap tubular tires and very nice wheels for them. The tires are perhaps 5 years old. The rims and hubs are older, but if they spin well and are true, you have a good set of wheels and will get a great ride on them. Test the tires by pumping them up and seeing how long they stay hard. Those tires should go at least a week before they need to be pumped again.

I would not change them, but it might be good to get a set of spare 700c clincher wheels with 25 mm tires.

And the bike looks like a great find - congratulations!
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Old 07-04-14, 08:47 PM
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Nice looking bike!

Can't help you with the wheel size, but can wish you best of luck with them and the bike.

Regards, Dick
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Old 07-04-14, 08:58 PM
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Originally Posted by Road Fan View Post
Test the tires by pumping them up and seeing how long they stay hard. Those tires should go at least a week before they need to be pumped again.
If they have latex tubes inside the tires they may go noticeably soft in a few days.

Nice bike!
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Old 07-05-14, 09:10 AM
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The crank is cottered and has Simplex adapters and rings. I like the way it looks enough to put one on my Jeunet. It came off of a '74 PA10.


Last edited by Grand Bois; 07-05-14 at 09:24 AM.
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Old 07-05-14, 09:45 AM
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I have a set of those tires. Had them at least 15 years. A pretty good tire. If you want to change to 27 inch rims however, it looks as though you have plenty of clearance room to do so.

I agree. Nice bike. Nice rims.
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Old 07-05-14, 09:51 AM
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Originally Posted by rootboy View Post
If you want to change to 27 inch rims however, it looks as though you have plenty of clearance room to do so.
But if you want to change rims just to avoid tubulars then why not stay with 700c (622)?
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Old 07-05-14, 11:10 AM
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Good point.
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