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Lemans mk1 front issue -new 110/90 to wide

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Dave P. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave P. Quote  Post ReplyReply Direct Link To This Post Posted: 27 Mar 2018 at 15:38
Originally posted by jpc jpc wrote:

Does anyone have a bike in her/his shed fitted with a 3.50-18 tyre ?  (Dunlop K82...)

I'd be curious to know if the measures are closer to 90/90 or to 100/90.


Yes,both of my Loops have 350/18 K82's up front.They are exactly 100mm wide.

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jpc View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jpc Quote  Post ReplyReply Direct Link To This Post Posted: 27 Mar 2018 at 16:37
Thanks Dave, precisely the Heidenau max figure (93 to 100).

The Avon 90/90 is 93 mm so presumably the 100/90 might be about 103 mm.

For some reason tyre specialists always try to flog the fattest tyre they can.

Interesting to note that Avon also make a 90/90/18 STREETRUNNER that's narrower, 85 to 90 mm depending on rim width !


Edited by jpc - 27 Mar 2018 at 17:52
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Drumnagorrach View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Drumnagorrach Quote  Post ReplyReply Direct Link To This Post Posted: 27 Mar 2018 at 19:41
Originally posted by Brian UK Brian UK wrote:

Originally posted by Drumnagorrach Drumnagorrach wrote:

While we are on with tyres sizes ,what do you lot think about reducing the tyre sizes on my 1100 Cali (1995 ) . the manual states 110/90-18 front and 140/80-17 rear .

What were the Cali III sizes?
My SPIII had a 120/90 18 rear. It the time I did compare specs with other similar models and they were the 100/90 front rather than the 110/90 I had (and which was in the spec).
Changing did make a world of difference to me, but obviously on a slightly different bike, who can say?
 

I think I know what the problem is Brian . My Cali has a 17 in back wheel with a fat tyre 140/90( yet more styling nonsense) . The Cali 3 has an 18 in rear with a 120/90 tyre .
My old Cali 3 was ugly but handled , this 1100i was ugly and doesn't handle as well ,progress?
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Brian UK View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 27 Mar 2018 at 20:20
Changing the front for the smaller size will drop the front end by about 9mm.
As an experiment you could try raising the stanchions through the yokes by about the same amount to see if it affects things. That won't cost anything and is easy to reverse.
 
However the smaller section tyre will also have an effect when leaning, not so easy to replicate without changing the tyre.
Brian.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote ReggieV Quote  Post ReplyReply Direct Link To This Post Posted: 28 Mar 2018 at 11:18
The English version of the Le Mans Owners Manual says the following;
 
Front 3,50 H - 18" or 100/90 H - 18"
Rear 4,00 H - 18" or 110/90 H - 18" or 4,10 V - 18"
 
I have two Guzzi alloy front wheels with 100/90 tyres fitted to them,
1. Bridgestone BT45 100/90 measures 100 mm.
2. Pirelli Sport Demon 100/90 measures 101 mm.
 
Out of interest?
On my Commando the 100/90 Avon Roadrider measures 102 mm.
On my T160 the Continental Classic Attack 100/90 measures 95mm. On this bike the rear 110/90 Classic Attack tyre is 7mm narrower and has 5mm less height than the 110/90 Avon Roadrider. It makes the bike look like an FS1E from behind. Very strange.


Edited by ReggieV - 28 Mar 2018 at 11:23
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jpc View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jpc Quote  Post ReplyReply Direct Link To This Post Posted: 28 Mar 2018 at 11:40
Obviously you can go either way on the front, 90 or 100.

I've been happy for so long with the 90, never thought of going bigger, no point (?).

I once tried a Michelin rear, had two frights in as many miles, exiting corners a yard from where I intended to, changed back immediately.

IMO nothing beats the Avon pair on a Tonti. Shame the new rear Roadrider now has a centerline groove, it doesn't last as long.
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Barry View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Barry Quote  Post ReplyReply Direct Link To This Post Posted: 28 Mar 2018 at 12:27
100/90 doesn't mean 100 or 90.
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jpc View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jpc Quote  Post ReplyReply Direct Link To This Post Posted: 28 Mar 2018 at 12:58
It does mean 100 mm and height 90% of width, but......
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Dukedesmo View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dukedesmo Quote  Post ReplyReply Direct Link To This Post Posted: 28 Mar 2018 at 15:13
Originally posted by kateguy kateguy wrote:

100 on the front 110 on the back on mine....

As per the owners manual (at least for LM2, with the same wheels);


Although it does also show 3.50 front and 4.00/4.10 rear depending on brand?

As an aside, I have a new 110/90 Pirelli 'Sport Demon' in the workshop waiting to go on and it actually measures 114mm which is only 2mm less than a 120/70 Pirelli 'Angel GT' and only 4mm less than a 120/70 Pirelli 'Diablo Rosso 3' both of which are also awaiting fitment to other bikes... 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Northy Quote  Post ReplyReply Direct Link To This Post Posted: 29 Mar 2018 at 16:56
Thanks for all the replies etc looks like it down to make of tyre if a 100 is actually 100.

BT45 are good as used them on other bikes, at least they are 100mm wide so for next time I will know. Or on safe side get a 90/90.



Edited by Northy - 29 Mar 2018 at 16:59
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Mike H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 30 Mar 2018 at 20:02
Originally posted by Dukedesmo Dukedesmo wrote:


Although it does also show 3.50 front and 4.00/4.10 rear depending on brand?

Yep I remember that.

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