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Old 10-08-2007, 03:14 AM   #106
jaydee1445
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Quote:
Originally Posted by wsmc99
Was that a 908 front and rear or just rear?
If you had something different in front, what was it?
908rr front and rear.
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Old 10-10-2007, 02:03 AM   #107
wsmc99
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Magic Numbers!

So I ran a freinds 950 along with mine side by each to test a theory.

His bike had a new 908rr rear and MT21 front.

Mine had a new 908rr and worn TKC front.

Both running 32 psi front and rear.

My theory was that the difference between front and rear dia/rad was the key. I know the stock figures for all the tires and I know that the Scorpions being sooo stable have a difference of +15mm in front. So my guestimate figured that the ideal ratio front to rear would be about +10-12mm.

I tested my freinds bike at +18mm & +12mm first. There was a mph where it would shake a bit and then settle. Neither configuration was what I'd call flickable. So we added some more rear preload/ride height and tried +8mm which was really nice and flickable while still being stable pretty much no shake at all.

We then tried it at +6mm and found it to be flickable but prone to bar shake more so than any other setting.

I then moved to my bike and set it to +8mm to see if this was the magic number. Indeed it was great!

So it looks as though the "sweet" range is +8mm -10mm in front.

To do this I took the known delta of the tires (+8mm in the MT21/908rr case) and set the dynamic sag figures to be +0mm. +8mm (from tire) + +0mm (from sag/ride height) = +8mm total...Voila!

In the case of my bike with the worn TKC front and new 908 rear the tire delta was -4mm front. I set my sag delta to +12mm front. -4mm + 12mm = +8mm and again, Voila! Great handling bike.

I do think the inherent construction difference in the MT21 vs. TKC makes it a little busy at the front, but not dangerous in any way. Just a different feel.
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Old 04-18-2008, 06:49 PM   #108
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bump
anyway. what about the 990 with the super wide rear rim?

anyone try the teraflex? it comes up bigger than the 908rr and quite abit less money.

.

I need to get a set soon so...what say the 990 owners. as in yesterday...
the mt 21 front is a given but I'm ready to try the teraflex VS 908rr so.
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Old 04-19-2008, 05:22 AM   #109
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slackers
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Old 06-21-2009, 11:15 PM   #110
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I went from the TCK 80 rear to the 908 rear, and must agree the first couple of km’s the rear of the bike was all over. But now with some km’s on it, the tyre hold well on tar and dirt. The only downside is the price of this in South Africa. If I convert this to US$ it is $333... :(
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Old 06-22-2009, 04:02 AM   #111
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Quote:
Originally Posted by scalci
I went from the TCK 80 rear to the 908 rear, and must agree the first couple of kms the rear of the bike was all over. But now with some kms on it, the tyre hold well on tar and dirt. The only downside is the price of this in South Africa. If I convert this to US$ it is $333... :(
You getting ripped,we paying about R1800!
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Old 10-03-2009, 11:49 AM   #112
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Originally Posted by edgy
You getting ripped,we paying about R1800!
Where is this from Edgy and what front are you using on the SE?
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Old 12-03-2009, 04:28 AM   #113
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Okay, time for me to stir up the pot...

I need tyres for my 08 990ADV, but in Israel tyres are unbelievably expensive, really, think expensive then double it, then double it again, we are talking outrageous prices.

I want something more dirt oriented than Scorpions, but as I use the bike everyday to get to work and back (only 30km round trip) they need to hold up to road use too, and with the prices they charge here I really need something with a little longevity.

Recommendations please?

Thanks!

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Old 12-03-2009, 04:53 AM   #114
codys
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I'd say Mefo Super Explorer if you can get it. Heidenau (sp) makes a similar tire too. Longevity, good on the paved, plus an upgrade in the off road area compared to a scorpion.

908rr dunlops last pretty good too but the center knob will be mostly gone at 2k miles. I've pushed them 5.5k mile commuting with pretty much no knob left at the end.
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Old 12-03-2009, 05:14 AM   #115
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Quote:
Originally Posted by codys
I'd say Mefo Super Explorer if you can get it. Heidenau (sp) makes a similar tire too. Longevity, good on the paved, plus an upgrade in the off road area compared to a scorpion.

908rr dunlops last pretty good too but the center knob will be mostly gone at 2k miles. I've pushed them 5.5k mile commuting with pretty much no knob left at the end.
Very interesting, thanks.

Do you recommend the matching front?
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Old 12-03-2009, 02:10 PM   #116
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I put a conti tkc 80 on front because it grips well everywhere and have had them last 7k miles. Cupped to hell in the end though. Not good in the rocks (square edge rocks especially) though. SOft side wall=rim damage. I'm not in the rocks when in tour mode so tkc front and mefo/scorp rear works great.

I match a pirelli mt-21 with the 908rr local COlorado riding. The stiff side walls of this combo makes rock damage to the rim much less likely. Decent on the road and damn solid off.

Good luck.
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Old 12-03-2009, 03:16 PM   #117
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Quote:
Originally Posted by codys
I put a conti tkc 80 on front because it grips well everywhere and have had them last 7k miles.
The Karoo T is another good option for a street-worthy tire that's better than the Scorp in the dirt but lasts a reasonable amount of time.
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