Inner tube size?
10-14-19, 12:18 PM
#1
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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.
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.
10-14-19, 12:42 PM
#2
Really Old Senior Member
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.
The boxes usually marked to fit both sizes.
You'd want something around a 622-28.
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.
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.
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
I use 700C tubes in 27" tires without any problems.
Cheers
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.
10-15-19, 06:05 PM
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10-16-19, 06:03 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.
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.
So, what would be an appropriate inner tube I could buy on Amazon.ca for example?
10-16-19, 07:13 PM
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The tire looks old, too. Might be worth getting new tires of the right BSD while you’re at it, OP.
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.
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.
