Does this work????
http://www.dropbears.com/u/utilities/tyrerim.htm
Gotta look for it a little. Looks like a rim 2.5 - 3.5 would work.
http://www.dropbears.com/u/utilities/tyrerim.htm
Gotta look for it a little. Looks like a rim 2.5 - 3.5 would work.
Taffy,
If your talking about those 6 Day tyres? like the std fitment on current Bergs they are measured from the outer most width and are really only equal to 110/100-18 or the newer size 120/90-18 (slightly bigger patch area) and these tyres work on 2.15 - 2.5" rims.
Regards
Sutto
If your talking about those 6 Day tyres? like the std fitment on current Bergs they are measured from the outer most width and are really only equal to 110/100-18 or the newer size 120/90-18 (slightly bigger patch area) and these tyres work on 2.15 - 2.5" rims.
Regards
Sutto
Joined Nov 2001
17K Posts | 774+
Ely, England
this is for a sidecarX. we want to spread the tyre for maximum grip. i was taught at college in the late 70s that the squat ratio was the sidewall height versus the width so that if a tyre was a 5.20 x 13" it was deemed 'square'. then they started making the sidewalls shorter (thus the rolling diameter smaller) and we had the 165/70 x 13". so far = easy to follow.
now when i see a 140/80 they want it on one rim and then they want a 140/60 on an even wider rim? so can you explain or give me a link to somewhere that explains this for me?
so what i need now is a 3.25/3.5 18" supermoto rear to suit a husaberg or KTM?
are they rare coz everything seems to be 17"?
regards
Taffy
now when i see a 140/80 they want it on one rim and then they want a 140/60 on an even wider rim? so can you explain or give me a link to somewhere that explains this for me?
so what i need now is a 3.25/3.5 18" supermoto rear to suit a husaberg or KTM?
are they rare coz everything seems to be 17"?
regards
Taffy
AAARRHH, Now I see!
Sidecars, Look if it takes 2 people to ride 1 motorcycle it is not going to be pretty?
Regards
Sutto
ps. Try old Ducati spoke rims maybe?
Sidecars, Look if it takes 2 people to ride 1 motorcycle it is not going to be pretty?
Regards
Sutto
ps. Try old Ducati spoke rims maybe?
Hi,
we use a normal 2.50x18 rim with the 140/80 and 5" mx tires. When you use a lower tire like 120/90x19, the lower height increases the risk of punctures especially with sidecar racing. A bigger air chamber is safer.
See this picture :wink: : http://www.husaberg.org/index.php?name= ... ad&id=2020
The tire will spread out anyway when riding because you don't use an extreme high tire air pressure. By spreading the sidewalls with a broader rim and lower side wall heigth, you may loose the self cleaning effect of the tire too. It's difficult to get get those large tires but Mefo is selling them specially for sidecar cross.
Best regards,
Stephan
we use a normal 2.50x18 rim with the 140/80 and 5" mx tires. When you use a lower tire like 120/90x19, the lower height increases the risk of punctures especially with sidecar racing. A bigger air chamber is safer.
See this picture :wink: : http://www.husaberg.org/index.php?name= ... ad&id=2020
The tire will spread out anyway when riding because you don't use an extreme high tire air pressure. By spreading the sidewalls with a broader rim and lower side wall heigth, you may loose the self cleaning effect of the tire too. It's difficult to get get those large tires but Mefo is selling them specially for sidecar cross.
Best regards,
Stephan
Joined Nov 2001
17K Posts | 774+
Ely, England
i have checked and a 3.5" rim should be used with a 140/80 tyre. now if 3.5" is too big, i think that 2.5" is too small?
sorry stephan, your link didn't work? just tell me where it is might help?
i also think it's important that the walls of the tyre aren't parallel but are pointed outwardly? so a 3.5" would alter this slightly to more like parallel.
do you use MX tyres all the year around stephan or do you put more rubber down in the summer with an enduro tyre?
regards
Taffy
sorry stephan, your link didn't work? just tell me where it is might help?
i also think it's important that the walls of the tyre aren't parallel but are pointed outwardly? so a 3.5" would alter this slightly to more like parallel.
do you use MX tyres all the year around stephan or do you put more rubber down in the summer with an enduro tyre?
regards
Taffy
Fixed the link, typo. MX all the season around (only 5 months here!) but different types of tires depending on the track's surface. The 5.00x18 Russian tire in the picture is for real deep sand and mud. For the other tracks, sandy - intermediate, we're using Mefo 140/80-14 MP500 tires. We do not have many real hard tracks and this keeps the choice limited.
For solo bikes www.mefo.de is maybe an interesting link, they offer a 5.10x18 tire. For sidecars http://www.mefo-sidecarcross.de .
Best regards,
Stephan
For solo bikes www.mefo.de is maybe an interesting link, they offer a 5.10x18 tire. For sidecars http://www.mefo-sidecarcross.de .
Best regards,
Stephan
Mefo Sport is a German company, former Barum importer, and as far as I know their tires are made in Germany by Heidenau. The Russian tire on the picture is difficult to get because there's no official sales representative. I do not even know the brand because my knowledge of the Russian language is zero.
But my choice of tires is depending on the tracks here in Finland and the Baltic. I see at the pictures of races in the UK that you have very different tracks.
Best regards,
Stephan
But my choice of tires is depending on the tracks here in Finland and the Baltic. I see at the pictures of races in the UK that you have very different tracks.
Best regards,
Stephan
Joined Oct 2005
935 Posts | 21+
Texas
Joined Nov 2001
17K Posts | 774+
Ely, England
thanks john!
yet more confirmation that we have the wrong rim but i guess these are for the roads.
looking at the charts, if a 3.00" rim was a minimum for a 140/80 x 18" then if you could find and try a 140/60 or 140/70 you would get your profile back.
the proof of the pudding is in the eating!
regards
Taffy
yet more confirmation that we have the wrong rim but i guess these are for the roads.
looking at the charts, if a 3.00" rim was a minimum for a 140/80 x 18" then if you could find and try a 140/60 or 140/70 you would get your profile back.
the proof of the pudding is in the eating!
regards
Taffy
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