Planet Minis

RonKMiller · 12-11-2007, 01:27 PM

I've been looking but cannot find the correct tubes/valve stems for my 69 Z50.

What I've found are the 90 degree angle metal stems that are located in the center of the tube and vulcanized to the tube without any locking nut. These will work but they aren't correct. Since the exit hole on the wheel rim is offset this causes the tube to be somewhat pinched on the inside. Not a problem for most folks, but since I plan on riding on the street at higher speeds this could cause a safety issue since there is some stress there where it should not be.

The original Bridgestone tubes have the stem offset to one side of the tube and have a locking collar with a nut that securely fastens the valve to the wheel rim.

Here's a picture of what the valve should look like. I'm after 3.50 X 8 tubes and would appreciate any links...

THANKS!

FastMC · 12-11-2007, 01:37 PM

Have you tried your local Honda dealer ? Honda lists them from Bridgestone right off the microfiche for about $15.

Tanglefoot · 12-11-2007, 02:40 PM

Check out this site - reasonable prices - Z50 Z50A Z50R XR50 CRF50

Tanglefoot · 12-11-2007, 02:40 PM

dratv.com , sorry...

RonKMiller · 12-11-2007, 04:27 PM

Quote:

Originally Posted by FastMC

Have you tried your local Honda dealer ? Honda lists them from Bridgestone right off the microfiche for about $15.

Yep - they had 'em and for only $5.95 each! Kewl...

Z50King · 12-11-2007, 04:53 PM

i use the msr heavy duty tubes that my Honda dealer sells for the z. they have an offset 90 degree stem.

the only tube ive ever popped on the z was the stock rear. i have since got the hd ones and had no troubles.

now changing the tires, thats a different story!

RonKMiller · 12-24-2007, 07:19 AM

Still no luck - Honda has them on "backorder" which to me means it ain't gonna' happen.

I don't think they exist.

All I want for Christmas is two 3.50 X 8 tubes with an offset PV78 stem. The CORRECT replacements.

Santa..... don't you have them mounted on your Z 50 sleigh?

Lair · 12-24-2007, 10:30 AM

I sold a '71 last week, and noticed that it had OEM locknut tubes front and rear.

I didn't see them until I was sitting in a parking lot waiting to meet the buyer. If I'd seen them sooner, I would have snagged them for you.

Lair · 12-24-2007, 10:39 AM

Quote:

Originally Posted by RonKMiller

I've been looking but cannot find the correct tubes/valve stems for my 69 Z50.

What I've found are the 90 degree angle metal stems that are located in the center of the tube and vulcanized to the tube without any locking nut. These will work but they aren't correct. Since the exit hole on the wheel rim is offset this causes the tube to be somewhat pinched on the inside. Not a problem for most folks, but since I plan on riding on the street at higher speeds this could cause a safety issue since there is some stress there where it should not be.

The original Bridgestone tubes have the stem offset to one side of the tube and have a locking collar with a nut that securely fastens the valve to the wheel rim.

If you can't locate the proper parts, you can snag a couple of these valve stem supports off your neighbor's Porsche:

RonKMiller · 12-24-2007, 05:15 PM

Quote:

Originally Posted by Lair

I sold a '71 last week, and noticed that it had OEM locknut tubes front and rear.

I didn't see them until I was sitting in a parking lot waiting to meet the buyer. If I'd seen them sooner, I would have snagged them for you.

Ahh, thanks. I've got a set - but they are 40 years old and I don't trust em' - even though they STILL hold air... leave it up to Porsche to come with something like that - probably $25.00 each. At least that's not as bad as
Ferrari - they are now selling their logo plates on the sides of the car as an OPTION.

allmakesmx · 12-27-2007, 06:10 PM

maybe these???
TUBE: 3.50/4.00x8 - 90° VALVE - Z50 / Monkey Bike Chassis

12-11-2007, 01:27 PM	#1 (permalink)
RonKMiller 1st Gear Member Join Date: Nov 2007 Posts: 124	Where can I buy the correct tubes? I've been looking but cannot find the correct tubes/valve stems for my 69 Z50. What I've found are the 90 degree angle metal stems that are located in the center of the tube and vulcanized to the tube without any locking nut. These will work but they aren't correct. Since the exit hole on the wheel rim is offset this causes the tube to be somewhat pinched on the inside. Not a problem for most folks, but since I plan on riding on the street at higher speeds this could cause a safety issue since there is some stress there where it should not be. The original Bridgestone tubes have the stem offset to one side of the tube and have a locking collar with a nut that securely fastens the valve to the wheel rim. Here's a picture of what the valve *should* look like. I'm after 3.50 X 8 tubes and would appreciate any links... THANKS! Attached Thumbnails

12-11-2007, 01:37 PM	#2 (permalink)
FastMC Sporting the Merkin Join Date: Mar 2004 Location: boston area Posts: 5,072 My Mood:	Re: Where can I buy the correct tubes? Have you tried your local Honda dealer ? Honda lists them from Bridgestone right off the microfiche for about $15.

12-11-2007, 02:40 PM	#3 (permalink)
Tanglefoot PM Newbie Join Date: Dec 2007 Location: Raleigh, NC Posts: 4	Re: Where can I buy the correct tubes? Check out this site - reasonable prices - Z50 Z50A Z50R XR50 CRF50

12-11-2007, 02:40 PM	#4 (permalink)
Tanglefoot PM Newbie Join Date: Dec 2007 Location: Raleigh, NC Posts: 4	Re: Where can I buy the correct tubes? dratv.com , sorry...

12-11-2007, 04:53 PM	#6 (permalink)
Z50King 3rd Gear Member Join Date: Sep 2004 Location: Upland, Ca, CPP Posts: 9,758 My Mood:	Re: Where can I buy the correct tubes? i use the msr heavy duty tubes that my Honda dealer sells for the z. they have an offset 90 degree stem. the only tube ive ever popped on the z was the stock rear. i have since got the hd ones and had no troubles. now changing the tires, thats a different story!

12-24-2007, 07:19 AM	#7 (permalink)
RonKMiller 1st Gear Member Join Date: Nov 2007 Posts: 124	Re: Where can I buy the correct tubes? Still no luck - Honda has them on "backorder" which to me means it ain't gonna' happen. I don't think they exist. All I want for Christmas is two 3.50 X 8 tubes with an offset PV78 stem. The CORRECT replacements. Santa..... don't you have them mounted on your Z 50 sleigh? Attached Thumbnails Last edited by RonKMiller; 12-24-2007 at 07:26 AM.

12-24-2007, 10:30 AM	#8 (permalink)
Lair 2nd Gear Member Join Date: Nov 2007 Location: Birmingham, AL (Not a native.) Posts: 401	Re: Where can I buy the correct tubes? I sold a '71 last week, and noticed that it had OEM locknut tubes front and rear. I didn't see them until I was sitting in a parking lot waiting to meet the buyer. If I'd seen them sooner, I would have snagged them for you.

12-27-2007, 06:10 PM	#11 (permalink)
allmakesmx 2nd Gear Member Join Date: Dec 2006 Location: Massachusetts, USA Posts: 256	Re: Where can I buy the correct tubes? maybe these??? TUBE: 3.50/4.00x8 - 90° VALVE - Z50 / Monkey Bike Chassis

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