Help! Need to replace inner tube

dunc

RAF/Sparrowhawk/SC 2.5 FI
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Aug 1, 2016
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Crawford, CO
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1967 Turbo/RSTOL/VG Cessna 185 Skywagon, 1946 Grumman TBM Avenger
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I need to replace an inner tube. My wheels, which I assume are "standard", have provision for the valve stem right in middle of two halves. This means the valve stem must be "clocked" a zero degrees referenced to the inner diameter of the tube. Not finding any. Any sources out there?
 

dunc

RAF/Sparrowhawk/SC 2.5 FI
Joined
Aug 1, 2016
Messages
164
Location
Crawford, CO
Aircraft
1967 Turbo/RSTOL/VG Cessna 185 Skywagon, 1946 Grumman TBM Avenger
Total Flight Time
5000
Desser has sent me two wrong tubes already. It is not clear about the other source but I will contact them. Thanks!
 

dunc

RAF/Sparrowhawk/SC 2.5 FI
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Messages
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Location
Crawford, CO
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1967 Turbo/RSTOL/VG Cessna 185 Skywagon, 1946 Grumman TBM Avenger
Total Flight Time
5000
Your azusaeng vendor also does not sell these.
 

dunc

RAF/Sparrowhawk/SC 2.5 FI
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1967 Turbo/RSTOL/VG Cessna 185 Skywagon, 1946 Grumman TBM Avenger
Total Flight Time
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Well, this forum was of no use so far. :(
 

ultracruiser41

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I don’t know..... I’ve never had trouble finding troops before. Dresser... Aircraft Spruce...Wicks.... Tractor supply... McMaster Carr.... Northern Tool..... somebody always has them.
 

dunc

RAF/Sparrowhawk/SC 2.5 FI
Joined
Aug 1, 2016
Messages
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Location
Crawford, CO
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1967 Turbo/RSTOL/VG Cessna 185 Skywagon, 1946 Grumman TBM Avenger
Total Flight Time
5000
I don’t know..... I’ve never had trouble finding troops before. Dresser... Aircraft Spruce...Wicks.... Tractor supply... McMaster Carr.... Northern Tool..... somebody always has them.
I don't doubt you, but have tried most of your list. I have bought dozens of aircraft tubes and tires in 50 years of flying, and 30 years of being an A&P on certificated and WWII aircraft. I don't know if my RAF's split rim wheels are "stock", but they require the valve stem be exactly on the inner circumference of the tube. That seems to be the hard thing to find.

I was just hoping somebody would simply reply with the brand, model number, and vendor they had bought their most recent RAF tubes from. Or even confirm whether my RAF's wheels are "stock".
 

Brian Jackson

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Sorry I couldn't be more help Duncan. I am unfamiliar with RAF specs, but my Azusa wheels are also symmetrical split rim (matched halves) with the valve stem at the center of the inner diameter like what you are describing. I've not bought many tubes in my life but would have thought these would be easy to find. Are there any identifying markings on either the rims or the innertube you're replacing? Might help narrow your search down, but I'm sure you've thought of that already.

That's the beauty of standards... there's so many to choose from.
 

dunc

RAF/Sparrowhawk/SC 2.5 FI
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Messages
164
Location
Crawford, CO
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1967 Turbo/RSTOL/VG Cessna 185 Skywagon, 1946 Grumman TBM Avenger
Total Flight Time
5000
Ahh - standards! Sadly there are no identifying marks on the existing tubes. Do yours have any? Maybe I could call Azusa.

I just found a vendor that makes a 13x500-6 tube with verbally "guaranteed" valve stem placement on the inner circumference. I have ordered one and will reply back in the sake of full disclosure if it works. The rubber might be stretched a bit, but if it holds air.... I don't land on grass, so not too afraid of thorns.

GyroBee Ultralight gyro, eh? Looks interesting.
 

Brian Jackson

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GyroBee Ultralight gyro, eh? Looks interesting.
The "ultralight" part went away with the 503, but yep. First gyro so trying to keep it simple. But as you're experiencing too, simplicity is often fraught with complication along the way :)
 
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