8" tyre sizes and tubeless rims.
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Hooked
1962 VBB1
Joined: 30 Aug 2011
Posts: 178
Location: vancouver
Thu Jul 11, 2019 1:34 pm quote
Hi, I currently run 4.00x8 tyres on my VBB on original rims. Been running them for years with no problem. I just got a flat so I am thinking about tubeless rims.

Can I put 4.00 x 8's on SIP tubeless rims?

Heidenau K75's come in 110/80, 120/70, and 3.50x8. How big and wide are the 3.50's compared to the 110's and 120's?

The tyres I am running now are Kings. Not great but I got them cheap from a friend. I like the width of the 4x8's, but I mainly put them on for the height.

Cheers,
Simon
Ossessionato
1976 Super (x 2), 1974 Primavera (x 2), 2006 Fly 150
Joined: 26 Sep 2013
Posts: 4674
Location: So Cal
Thu Jul 11, 2019 3:21 pm quote
Good to hear the 4.00 x 8’s fit... I was under the impression they wouldn’t fit without rubbing.

4.00x8 tire

Here’s how the different K75’s compare in height, narrowest to widest:

3.50x8 - 90mm wide, 14.4” dia
4.00x8 - 100mm wide, 15.4” dia
110/80x8 - 110mm wide, 14.9” dia
120/70x8 - 120mm wide, 14.6” dia

Can’t tell you what fits on a tubeless rim, sorry.
Hooked
1962 VBB1
Joined: 30 Aug 2011
Posts: 178
Location: vancouver
Thu Jul 11, 2019 7:26 pm quote
Awesome!! One reply and I get exactly the info I need. Thanks so much!

I have never had a problem with rubbing on the front. I have seen a mild rubbing mark on the clutch cover but I suspect this only happens over a big bump. I have never felt it.

I suspect 4.00x8's won't fit on the SIP rims. On standard split rims they take an extra squeeze to get the nuts on. I'm not sure if it would work on the tubeless. I'll have to ask. I'll probably stay with the 4.00x8's though as the height/diameter is quite a bit more.

A pic that sort of shows the front tire spacing.

11990434_10152991038041237_607886929530000031_n.jpg

Ossessionato
2 matching N.Z. '69 VBC Super, 177cc Racer, VespaCross Bodge, Puch SRA150, Piaggio Zip 100! & others
Joined: 26 May 2013
Posts: 3764
Location: Millbin, Ostrayleea, mate
Sun Jul 14, 2019 5:21 pm quote
SoCalGuy wrote:
Good to hear the 4.00 x 8’s fit... I was under the impression they wouldn’t fit without rubbing.

4.00x8 tire

Here’s how the different K75’s compare in height, narrowest to widest:

3.50x8 - 90mm wide, 14.4” dia
4.00x8 - 100mm wide, 15.4” dia
110/80x8 - 110mm wide, 14.9” dia
120/70x8 - 120mm wide, 14.6” dia

Can’t tell you what fits on a tubeless rim, sorry.
That was always my thoughts (& experience) as well.
Veni, Vidi, Posti
a not so normal vbb2 '64, a weirdo vbx '86 and a not so normal pts100 '82
Joined: 15 Jun 2009
Posts: 5409
Location: Indo
Mon Jul 15, 2019 3:42 am quote
filmworker wrote:
Awesome!! One reply and I get exactly the info I need. Thanks so much!

I have never had a problem with rubbing on the front. I have seen a mild rubbing mark on the clutch cover but I suspect this only happens over a big bump. I have never felt it.

I suspect 4.00x8's won't fit on the SIP rims. On standard split rims they take an extra squeeze to get the nuts on. I'm not sure if it would work on the tubeless. I'll have to ask. I'll probably stay with the 4.00x8's though as the height/diameter is quite a bit more.

A pic that sort of shows the front tire spacing.
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