Articles by Sheldon Brown and others
Harris Home	Beginners	Brakes	Commuting Lights	Cycle- Computers	Do-It- Yourself	Essays
Family Cycling	Fixed Gear Singlespeed	Frames	Gears & Drivetrain	Bicycle Humor	Bicycle Glossary	Bicycle Links
Old Bikes	Repair Tips	Tandems	Touring	What's New	Wheels	Sheldon Brown

twenty seven 27 x 1 1/4 27 x 1 1/8 27x1 twentyseven twenty seven panaracer panasonic schwinn puff dunlop 27x1.25 27 x 1.25 continental michelin raleigh english high pressure bead avocet 630 iso etrto 630 schwinn varsity continental traveler raleigh record grand prix super course peugeot mercier

Accessories	Bicycles	Parts	Specials	Tools

In West Newton Since 1952 - On The Web Since 1995

27 inch Bicycle Tires from Harris Cyclery
(ISO/E.T.R.T.O. 630 mm)

This is the size used on most older 10- and 12-speed road bikes
made for the U.S. or British market including:

Dawes; Jeunet; Mercier 100; Peugeot UO-8,UE-8; Raleigh Grand Prix, Record, Super Course; Schwinn Varsity, Continental, Super Sport; Univega; Vista and many others.

Other Tire Sizes	General Article on Tires	Tire Sizing Systems Explained

Note on tire/rim compatibility:

Traditional 630 mm (27 inch) rims were straight side design, but in the late '70s they evolved to a "hook edge" design which would permit the use of higher pressures.
These days, many 630 mm (27 inch) tires are marked "For hook edge rims only" (some companies use the term "crochet type" instead of "hook edge"...this is the result of poor translation.)
The fact is that modern 630 mm (27 inch) tires will work on older straight-side rims, but they won't handle as much pressure as they are capable of with hook edge rims.
Generally, the "rule of thumb" for traditional 630 mm (27 inch) tires is that they should be inflated to 70-75 psi. This shouldn't be a problem with any tire, despite whatever disclaimer the manufacturer puts on the sidewall. However, if you're restricted to this pressure range, you probably shouldn't be running tires narrower than 1 1/8, or preferably 1 1/4, unless you're a very lightweight rider.

I.S.O. Size	Traditional Size	Brand	Model	Price	Kevlar Belt/Bead
40-630	27 x 1 3/8"	Club Roost	Cross Terra	$24.95		Very Aggressive knobby tread, blackwall, 40-65 psi
35-45-630	27 x 1 3/8"	Inner Tubes Schrader or Presta Valve		$4.95	This 35 mm - 45 mm tube size fits 622 mm rims with 700c x 35 mm - 43 mm tires as well as 630 mm rims with 27" x 1-3/8" tires. Since tubes are stretchy, they do not need to exactly match the size of the tire. Depending on stock, size shipped may not be exactly the same as listed.
32-630	27 x 1 1/4"	Continental	Ultra GatorSkin	$39.95	Belt	Light, (330g) fast semi-slick. These are really nice! Germany (Measured width* 27.5 mm)
32-630	27 x 1 1/4"	Continental	Ultra Sport	$19.95		Semi-slick road tread 380 grams
32-630	27 x 1 1/4"	Michelin	World Tour	$29.95		Traditional gumwall road tire. Excellent for classic restorations. (Measured width* 33 mm)
32-630	27 x 1 1/4"	Panaracer	Pasela	$19.95		Japanese quality, high performance tire. (different size shown)
32-630	27 x 1 1/4"	Panaracer	Pasela Tourguard Belted	$24.95	Belt	Japanese quality, high performance tire. Kevlar belt for puncture resistance (different size shown)
32-630	27 x 1 1/4"	TRB33 Schwalbe	Marathon	$37.95	Belt	Highly-regarded touring/rough stuff/city tire. Features reflective sidewalls for visibility, special Kevlar/rubber belt for puncture resistance...
28-32-630	27 x 1 1/8" - 1 1/4"	Inner Tubes Schrader or Presta Valve		$4.95	This 28 mm - 32 mm tube size fits 622 mm rims with 700c x 28 mm - 32 mm tires as well as 630 mm rims with 27" x 1-1/8" - 1 1/4" tires. Since tubes are stretchy, they do not need to exactly match the size of the tire. Depending on stock, size shipped may not be exactly the same as listed.
28-630	27 x 1 1/8"	Panaracer	Pasela Tourguard Belted	$24.95	Belt	Japanese quality, high performance tire. Kevlar belt (Measured width* 25.5 mm)
28-630	27 x 1 1/8"	Panaracer	Pasela	$19.95		Japanese quality, high performance tire Japanese quality, high performance tire. (Measured width* 25.5 mm)
25-630	27 x 1"	Panaracer	Pasela	19.95		Japanese quality, high performance tire. (different size shown)
25-630	27 x 1"	Panaracer	Pasela Tourguard Belted	$24.95	Belt	Japanese quality, high performance tire. Kevlar belt for puncture resistance (different size shown)
22-25-630	27 x 1"	Inner Tubes Schrader or Presta Valve		$4.95	This 23 mm - 25 mm tube size fits 622 mm rims with 700c x 23 mm - 25 mm tires as well as 630 mm rims with 27" x 7/8" - 1 1/8" tires. Since tubes are stretchy, they do not need to exactly match the size of the tire. Depending on stock, size shipped may not be exactly the same as listed.
~~Special Purchase!~~ ~~N.O.S. Avocet Super-skinny 27 x 7/8" FasGrip Slicks~~ These are the finest high performance tires ever made in the 27 inch size. The FasGrip slick was introduced just as the 700c size started to eclipse 27 inch. If you have a fine old high-performance bike that takes narrow 27" tires, this would be a good time to stock up, while you have the chance. The demand for 27" tires has become too small for any manufacturer to tool up to make high-quality exotic models any more. ~~Note: We bought Avocet's entire remaining stock of 27 inch tires, you won't find these anywhere else!~~						Sorry, these tires are all gone!! If we find a similar tire we will put it on our website.
18-23-622	27 x 7/8"	Inner Tubes Presta Valve		$4.95	This 18 mm - 23 mm tube size fits 622 mm rims with 700c x 18 mm - 23 mm tires as well as 630 mm rims with 27" x 1" or narrower tires. Since tubes are stretchy, they do not need to exactly match the size of the tire. Depending on stock, size shipped may not be exactly the same as listed.