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Inner tube size?

Old 10-14-19, 12:18 PM
  #1  
Tranquility
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Inner tube size?

Hi There,
I may not have forgotten how to ride my bike but I've forgotten how to size the inner tube.
Can someone please tell me what size inner tube I need to buy for my Miyata 610. I'm including a few pix.

It's been three decades since I've done this so I guess I'm "allowed" to forget.

I've included a few pix of the tires. Thank you!



A friend made me the wheels ~ four decades ago.
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Old 10-14-19, 12:42 PM
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Bill Kapaun
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You have a nominal 27" tube. 8mm greater diameter than a 700c.
The boxes usually marked to fit both sizes.
You'd want something around a 622-28.
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Old 10-14-19, 01:12 PM
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I agree with @Bill Kapaun.

It is harder and harder to find tubes that are marked only 27", but some are marked for both.

While the tire may be only 8mm larger in diameter than 700c, the tube is about 2.5 cm longer in circumference.

Anyway, the 700c tube should still fit. I don't use 27" much, but I'd probably choose a bit smaller tube (20 to 25mm), and inflate it slightly as installing which will cause it to stretch as much or more in length as in diameter.
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Old 10-15-19, 03:10 PM
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1 1/8 = about 28mm. Most tubes today will say on the box the size of tire they're good for. Usually they say 27" x what the width is and 700C plus the width they're good for.

I use 700C tubes in 27" tires without any problems.

Cheers
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Old 10-15-19, 04:29 PM
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Get a tube marked for 700c 25x28mm (622/28). Make sure you get the right stem too.
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Old 10-15-19, 04:35 PM
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Aren't those 27 inch tires on a 700 rim?
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Old 10-15-19, 06:05 PM
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Originally Posted by trailangel View Post
Aren't those 27 inch tires on a 700 rim?
Fine detective work! The pictures posted even show a poorly seated bead.
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Old 10-16-19, 06:03 PM
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Originally Posted by CliffordK View Post
I agree with @Bill Kapaun.

It is harder and harder to find tubes that are marked only 27", but some are marked for both.

While the tire may be only 8mm larger in diameter than 700c, the tube is about 2.5 cm longer in circumference.

Anyway, the 700c tube should still fit. I don't use 27" much, but I'd probably choose a bit smaller tube (20 to 25mm), and inflate it slightly as installing which will cause it to stretch as much or more in length as in diameter.
Hi Clifford,
So, what would be an appropriate inner tube I could buy on Amazon.ca for example?
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Old 10-16-19, 07:13 PM
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Originally Posted by Unca_Sam View Post
Fine detective work! The pictures posted even show a poorly seated bead.
I figured that was because of the flat tire for which he needs a new tube, but I think you guys are right.

The tire looks old, too. Might be worth getting new tires of the right BSD while you’re at it, OP.
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Old 10-16-19, 07:17 PM
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Originally Posted by trailangel View Post
Aren't those 27 inch tires on a 700 rim?
Yikes, that's a blowout waiting to happen. This calls for new tires.
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Old 10-16-19, 07:20 PM
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As far as tire size. Good question

The easiest thing is to measure the rim diameter (top of the brake track). Measure through the spokes, and around the hub the best you can (straight tape).

If the rim is about 640mm (top of the brake track), then it is a 27" rim.
If the rim is about 630mm (top of the brake track), then it is 700c.

Our local co-op has a V made with boards. Simply drop the wheel in to the V, and line it up with the line to tell the size or compare to other wheels.
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