What size tyres?? For my vintage Peugeot Triathalon.

[will16]

Hi all,
I new and have just bought a vintage peugeot racing bike, with reynolds 501 tubing! The tyres and tubes are shot though. I'm really having trouble finding tubes and tyres! The wheels are seriously skinny though!! They need to be 1/2" wide! Yes HALF AN INCH!! The diameter is 60/61cm, so the wheels would be 27" or 700c?? Maybe?? The rims are vintage Mavic aluminum rims too.
Thanks in advance,
Will

 

[bm0p700f]

Are they any markings on the tyres.

"27" is 630mm ERTO (bead seat diameter) comomly found on touring bikes.
622mm is the 700c size.
590mm is the 26 x 1/38 size and 597 is the 26 x 1 1/4" size(or habe I got those two the wrong way round.
584mm is another size (650B?).

When you say the width is half inch do you mean the infate tyre or the internal diameter of the rim. I hope you mean the later as the 13mm tyre is not one I have ever seem. 13mm internal rim witdth rims are fairly standard and will take anything from 19-25mm tyres. I would recomend 23mm and their are lots of options in that width if its a 700C wheel. If it is not and antoher size your options are very limited.

 

[will16]

Hi,
So you would think the wheels are 700c?? Yes the rim is 13mm wide, not the tyre.
Will

 

[ianfoot]

ooof.....that's narrow. Smallest I've seen is 1" for a 27" wheel.

 

[will16]

I know!!! Its my first bike and I love the retro stuff.

 

[will16]

I'm trying to do up the bike cheap-ish so what's the cheapest 700c x 19-23 tyre?? I've got the tubes sorted, but having trouble with the wheels! Prices have gone up so much!

 

[bm0p700f]

Conti Ultra sports are around £11 each. Vittoria also do cheap 23 section tyres. I would not recomend 19c tyres as the pressure have to very high to get the same rolling resistance as a 23c tyre. In fact so high it is probably beyond the max pressure of the tyre and rim.

Michelin also make cheap tyres in this width. I run the conti unltra sport on my bike and they are not that "punture proof" but good enough to allow several 60+ mile rides without incident.

 

[will16]

The original tyres were michelins too. I'll have a look around then!
Thanks,
Will

 

[tonyf39]

Yes as bm0p700f says 13mm refers to the inside diameter which in theory will take bigger than a 25 but you wouldn't want to. Depending on what use you're going to put the bike to & how heavy you are should dictate the cross section size of tyre.
If you're quite heavy go for 25s, if you're a featherweight & want it just for quick blasts don't be put off by getting 20s or 21s
It is as much about the deflection of the tyre than the out and out pressure.
This was determined as 15% being the ideal. So for me at 100kg I'll mostly use 25s and pump them up to 120/105 (rear/front)
Play around with the pressures until you get the trade off of ride comfort against rolling resistance. Don't go too high though as you'll just bounce around and actually raise the RR as a consequence.
Cheap reasonable tyres here.
2xMichelin speediums for £18.90 posted
http://www.ebay.co.uk/itm/Michelin-Spee ... 4cf34e5082

 

[bm0p700f]

In theory you can run wider than 25 on a 13mm rim but you risk more sidewall punctures as the tyre is not properly supported. There is no strict sizing guide for tyres. For example Parks site and their book say tyre width should be between x1.5 and x2 the internal width of the wheel. This works with a road wheel, but a MTB wheel with a 21 mm internal width (pretty normal these days would only take 42mm section tyre (thats 1.65"!) That is not real but as MTB tyres have stronger sidewall you can run wider.

Click on my website I may be able to help.