New tyres on my Kz 750 E1 1980
- philmountains
-
Topic Author
- Offline
- User
-
Registered
- Posts: 17
- Thanks: 6
New tyres on my Kz 750 E1 1980
22 May 2025 02:16 - 22 May 2025 02:19
Hi all , yesterday went to the garage to have a new tyre fitted, and I knew it had a tube in the old tyre but told the fitter that these rims are tubeless, anyway he had to refit the old inner tube back into the new tubeless tyre as he didn't have the correct size tyre valve, iI don't like this idea really so when I get the back tyre changed I'm wanting to get hold of a pair of tyres valves that fit , looking around on the forum and elsewhere looks like I need 8.3mm valves is this correct , I've found a couple that look Ok .on ebay etc.
thanks again for any help.
Phil
thanks again for any help.
Phil
Attachments:
Last edit: 22 May 2025 02:19 by philmountains.
Please Log in or Create an account to join the conversation.
- Wookie58
-
- Offline
- Moderator
-
Registered
- Posts: 5023
- Thanks: 3075
Re: New tyres on my Kz 750 E1 1980
22 May 2025 02:36 - 22 May 2025 03:29
That looks to me like a "tubeless" valve for a "spoked/chrome" rim. Valves for alloy rims are normally a "barbed all rubber construction that "pulls" through the rim. (see below) I believe they are a pretty standard item so would question what your tyre fitter has told you !!!!
PS: the tubes may have been fitted because there is corrosion on the rim stopping the beads sealing correctly ?
PS: the tubes may have been fitted because there is corrosion on the rim stopping the beads sealing correctly ?
1982 KZ1000 Ltd
www.kzrider.com/forum/11-projects/617631...-82-begins?start=192
kzrider.com/filebase-alias?view=download...d-fault-diagnosis&ca
www.kzrider.com/forum/11-projects/617631...-82-begins?start=192
kzrider.com/filebase-alias?view=download...d-fault-diagnosis&ca
Last edit: 22 May 2025 03:29 by Wookie58.
The following user(s) said Thank You: philmountains
Please Log in or Create an account to join the conversation.
- philmountains
-
Topic Author
- Offline
- User
-
Registered
- Posts: 17
- Thanks: 6
Re: New tyres on my Kz 750 E1 1980
22 May 2025 06:49
Hi there wasn't really any corrosion to see on the rims , and he did have the normal type in your picture but I think they were a larger diameter as used on cars, I'm sure that when I last got tyre fitted to a Zx9r I owned they just fit standard valves , I had these type of wheels on a Z550 in the 80s with metzeller me99 tyres fitted and i carnt remember having tubes in them , but that's a long time ago LOL.
M&P show them in 8.3 mm like in your picture but out of stock.
Thanks again Phil
M&P show them in 8.3 mm like in your picture but out of stock.
Thanks again Phil
The following user(s) said Thank You: Wookie58
Please Log in or Create an account to join the conversation.
- Nessism
-
- Online
- Sustaining Member
-
Registered
- Posts: 7728
- Thanks: 3114
Re: New tyres on my Kz 750 E1 1980
22 May 2025 06:52
The OEM valve stems follow JIS 430 standard. I personally like the all rubber type better, but I'm not sure if the hole in the wheel matches.
Ed
Carb O-ring Kits : www.kzrider.com/forum/3-carburetor/61807...-o-ring-kits?start=0
www.kzrider.com/forum/faq-wiki/618026-new-owner-things-to-know
1981 KZ750E2
www.kzrider.com/forum/11-projects/604901...z750e-project-thread
Carb O-ring Kits : www.kzrider.com/forum/3-carburetor/61807...-o-ring-kits?start=0
www.kzrider.com/forum/faq-wiki/618026-new-owner-things-to-know
1981 KZ750E2
www.kzrider.com/forum/11-projects/604901...z750e-project-thread
The following user(s) said Thank You: Wookie58, philmountains
Please Log in or Create an account to join the conversation.
- Wookie58
-
- Offline
- Moderator
-
Registered
- Posts: 5023
- Thanks: 3075
Re: New tyres on my Kz 750 E1 1980
22 May 2025 07:09Thanks Ed, every day is indeed a school dayThe OEM valve stems follow JIS 430 standard. I personally like the all rubber type better, but I'm not sure if the hole in the wheel matches

1982 KZ1000 Ltd
www.kzrider.com/forum/11-projects/617631...-82-begins?start=192
kzrider.com/filebase-alias?view=download...d-fault-diagnosis&ca
www.kzrider.com/forum/11-projects/617631...-82-begins?start=192
kzrider.com/filebase-alias?view=download...d-fault-diagnosis&ca
The following user(s) said Thank You: philmountains
Please Log in or Create an account to join the conversation.
- Nessism
-
- Online
- Sustaining Member
-
Registered
- Posts: 7728
- Thanks: 3114
Re: New tyres on my Kz 750 E1 1980
22 May 2025 10:23
Ed
Carb O-ring Kits : www.kzrider.com/forum/3-carburetor/61807...-o-ring-kits?start=0
www.kzrider.com/forum/faq-wiki/618026-new-owner-things-to-know
1981 KZ750E2
www.kzrider.com/forum/11-projects/604901...z750e-project-thread
Carb O-ring Kits : www.kzrider.com/forum/3-carburetor/61807...-o-ring-kits?start=0
www.kzrider.com/forum/faq-wiki/618026-new-owner-things-to-know
1981 KZ750E2
www.kzrider.com/forum/11-projects/604901...z750e-project-thread
The following user(s) said Thank You: Wookie58, philmountains
Please Log in or Create an account to join the conversation.
- philmountains
-
Topic Author
- Offline
- User
-
Registered
- Posts: 17
- Thanks: 6
Re: New tyres on my Kz 750 E1 1980
23 May 2025 00:22
I found these also on Ebay, I think I'll be ordering a couple , looks like my rims hole diameter is 8.3 mm and the most common is 11.5mm standard on most cars .
Also I've been looking at getting a new rear tyre and to match the new front one they only do it in 120/80/18 as apposed to 120/90/18 do you think the height measurement will cause any issues.
Thanks again Phil
Also I've been looking at getting a new rear tyre and to match the new front one they only do it in 120/80/18 as apposed to 120/90/18 do you think the height measurement will cause any issues.
Thanks again Phil
Please Log in or Create an account to join the conversation.
- Wookie58
-
- Offline
- Moderator
-
Registered
- Posts: 5023
- Thanks: 3075
Re: New tyres on my Kz 750 E1 1980
23 May 2025 01:16The difference in "wall height" is 12mm (10% of the width) so the overall diameter of the wheel will be 24mm smaller, I don't think this would have a significant impact on the way the bike "rides" but it will increase you highway revs to achieve the same speed with a smaller wheelI found these also on Ebay, I think I'll be ordering a couple , looks like my rims hole diameter is 8.3 mm and the most common is 11.5mm standard on most cars .
Also I've been looking at getting a new rear tyre and to match the new front one they only do it in 120/80/18 as apposed to 120/90/18 do you think the height measurement will cause any issues.
Thanks again Phil
1982 KZ1000 Ltd
www.kzrider.com/forum/11-projects/617631...-82-begins?start=192
kzrider.com/filebase-alias?view=download...d-fault-diagnosis&ca
www.kzrider.com/forum/11-projects/617631...-82-begins?start=192
kzrider.com/filebase-alias?view=download...d-fault-diagnosis&ca
The following user(s) said Thank You: kimchella, philmountains
Please Log in or Create an account to join the conversation.
- TexasKZ
-
- Offline
- Platinum Member
-
Registered
- Posts: 7901
- Thanks: 2480
Re: New tyres on my Kz 750 E1 1980
23 May 2025 06:48
I had some 90 degree all metal stems on my Concours, and loved them. It was very easy to check and adjust pressures. Here are some fancy ones.
www.kurveygirl.com/collections/valve-stems
www.kurveygirl.com/collections/valve-stems
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough
www.kzrider.com/11-projects/620336-anoth...uild-thread?start=24
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough
www.kzrider.com/11-projects/620336-anoth...uild-thread?start=24
The following user(s) said Thank You: philmountains
Please Log in or Create an account to join the conversation.
- DoctoRot
-
- Offline
- Sustaining Member
-
Registered
- Oh, the usual... I bowl, I drive around...
- Posts: 2574
- Thanks: 727
Re: New tyres on my Kz 750 E1 1980
23 May 2025 10:34
Metal valve stems are required for racing in my local race org. I run them on all my bikes now - street or track. I also like the 90 degree valve stems, easier to check pressure without burning yourself on a hot brake disc.
The following user(s) said Thank You: sf4t7, Wookie58, kimchella, philmountains
Please Log in or Create an account to join the conversation.
Moderators: Street Fighter LTD