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Inner tube for 700c beater #5116417 05/26/19 01:34 PM
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MrQuackers Online Content OP
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I have an old 90s Giant Farrago and it has 700c Schrader rims. Finding that tube is like hunting for hen's teeth. Is a 27x1.25 tube compatible? Tires are 700c x 35

Last edited by MrQuackers; 05/26/19 01:38 PM.

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Re: Inner tube for 700c beater [Re: MrQuackers] #5116489 05/26/19 03:25 PM
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skyactiv Offline
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Walmart might have in in stock near you today?
Presta or schrader valve is the question.

https://www.walmart.com/ip/Bell-Tube-700-x-35-43C-Presta-Valve/34038250


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Re: Inner tube for 700c beater [Re: MrQuackers] #5116490 05/26/19 03:25 PM
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JLawrence08648 Offline
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700 & 27 tubes are interchangeable but not the tires. 1.25 would be about right, worse case, stretches a little bit more inside the tire.I

You can buy inserts to convert Schraeder to Presta essentially they are O rings.

Re: Inner tube for 700c beater [Re: MrQuackers] #5116497 05/26/19 03:35 PM
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Number_35 Offline
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Check out this Wiki article on bicycle wheel sizing:

https://en.wikipedia.org/wiki/Bicycle_wheel#700C_road_bicycle_wheels_/_ISO_622_mm

700C and 29"ers use the same rim diameter - 622 mm. Typically you can go from a smaller nominal tube size to a larger nominal tire size, but not vice versa. E.g. Your 35 mm tire is about 1-3/8". You could use a smaller (for example, 1-1/4", tube in a 35 mm tire), but I would not use a 2" tube in a 35 mm tire.)

I'm not sure about 27" - it seems that the nominal sizes (700 mm, 26", and 29") pertain to the approximate O.D. of the wheel and tire assembly when a typical tire is fit to the rim. It seems to me that a 27" rim/tire combination is part of the 622 mm rim family, running a fairly skinny tire.

Examples:

A 26" mountain bike tire is typically around 2" in cross-section. A 26" rim is 559 mm (22") in diameter. 22" + 2(2") = 26". But if you went with a 1.5" tire, the O.D. would drop to 25". If you went with a 2.375" tire, the O.D. would be 26.75". So, the nominal 26" is an approximation.

A 29" mountain bike tire is typically around 2.2" in cross-section. A 29" rim is 622 mm (close to 24.5") in diameter. 24.5" + 2(2.2") = 28.9". If you ran a 1.5" tire instead, you'd be down around 27.5" O.D. If you went with a 2.7" tire, you'd be up at 29.9". So again, 29" is an approximation.

So in every case, the nominal wheel/tire combination's O.D. will vary in real life depending on tire size.

A "700 mm wheel" (the nominal size of a 622 mm wheel with a 39 mm tire installed) will be more or less depending on which tire is installed. 622 mm (actual rim diameter) + 2(35 mm) = 692 mm = 27.2". I would be that's what you've got.

For what it's worth, the Schwalbe Marathon tires on my Kona Dew Deluxe say "622 x 32/28" x 1-1/4"/700C x 32". I'd think that you'd be fine with any Schrader-valve equipped tube identified for use with 622 mm/700C/28" wheels for a nominal tire size of no less than 32 mm/1.25".

Bike experts, please jump in! I may have this wrong.

Re: Inner tube for 700c beater [Re: MrQuackers] #5116506 05/26/19 03:42 PM
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XCIDMigs Offline
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https://www.amazon.com/s?k=700x35c+tube+schrader+valve&crid=2RD0CK27VMSOH&sprefix=700x35c+tube%2Caps%2C169&ref=nb_sb_ss_i_5_8

Re: Inner tube for 700c beater [Re: MrQuackers] #5116508 05/26/19 03:44 PM
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Originally Posted by MrQuackers
I have an old 90s Giant Farrago and it has 700c Schrader rims. Finding that tube is like hunting for hen's teeth. Is a 27x1.25 tube compatible? Tires are 700c x 35


They are readily available on Amazon all day long:

700c Inner Tubes

Re: Inner tube for 700c beater [Re: MrQuackers] #5116856 05/26/19 09:39 PM
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Don't get the 'lite' which have thin walls and as lite as possible, they are pretty fragile.

Re: Inner tube for 700c beater [Re: MrQuackers] #5116894 05/26/19 11:25 PM
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Convert them to Presta and be done with it. 700C/Schrader is just kinda wrong.


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Re: Inner tube for 700c beater [Re: AZjeff] #5118930 05/29/19 06:17 AM
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NYEngineer Offline
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Originally Posted by AZjeff
Convert them to Presta and be done with it. 700C/Schrader is just kinda wrong.



That's funny and true. I built my mom a bike a few years back and I did Schraeder/700c only because I knew it would be easier for her. It pained me to drill those rims.

Re: Inner tube for 700c beater [Re: MrQuackers] #5119497 05/29/19 04:32 PM
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MrQuackers Online Content OP
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Thank you for the replies smile

GiantFarrago.jpg
Last edited by MrQuackers; 05/29/19 04:41 PM.

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Re: Inner tube for 700c beater [Re: MrQuackers] #5119508 05/29/19 04:40 PM
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IMHO, any beater in the USA should use Schrader valves so you can just fill up wherever and find spare tubes in Walmart. To me a "beater" is a bike that gets next to no maintenance and can be parked anywhere in any weather, and when it does need work parts are available at any bargain store. YMMV.

Re: Inner tube for 700c beater [Re: MrQuackers] #5119523 05/29/19 04:53 PM
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Re: Inner tube for 700c beater [Re: MrQuackers] #5122764 06/02/19 04:17 AM
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A 700c schrader tube is hardly a unicorn. Check any bike shop, Amazon, Nashbar, Jenson, etc. And yes, 700c/27in tubes are interchangable (unlike tires!).


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