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Discussion Starter #1
So its been 25C and very sunny here all day and on the ride home i was getting some nasty death weave above about 65-70mph. Yesterday it was almost as warm but not as sunny all day and it was fine up to 85mph as usual.

So my question. does this mean i should lower my tyre pressures because the heat has raised the pressure too high. Or. Does it mean i should raise the pressure because they are heating up too fast through the movement of the tyre as its softer in the heat?

Bike is a 690SM running Goldspeed race wet front and streetsport ultra rear at 25psi both ends.

Its been sitting outside work getting sunbaked so i wonder if thats the problem as it didnt happen last week when we had similar temperatures but was stored in the shade.
 

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Weather in Greece is much hotter than UK's, currently I am running on my 625 a michelin SM racing front with 30psi and a pilot power rear at 31psi. (I am going to SM racing rear as well as it used to be :rolleyes:)
I am not a clam driver at all :D and I've never faced a problem with overheating my tyres.
Probably your very low psi could cause the overheating.
 

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Good to hear you guys are finally getting a bit of warm weather after the crap winter. What tyre pressures are you running? It gets a lot hotter here and I run my BT016's at 34-36psi front and 36-38psi rear Summer and Winter. Anything under 32psi and the handling becomes vague and turns to crap through the tight stuff. Below 28psi and its all over the road like a mad womans shit.;)
 

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Discussion Starter #4
Im running race tyres so pressures are alot lower. Up till now 25/25psi felt absolutely beautiful, i mean the best handling i have ever experienced on anything ever. But now the weather is warmer its shaking its head. Might try adding a couple psi 2morrow and see how it goes.
 

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Im running race tyres so pressures are alot lower. Up till now 25/25psi felt absolutely beautiful, i mean the best handling i have ever experienced on anything ever. But now the weather is warmer its shaking its head. Might try adding a couple psi 2morrow and see how it goes.
I spent quite a few weeks testing different tyre pressures over the same 160klm of my favourite twisties until I ended up with this set up. Suspension is set about halfway so not too hard or soft. It wont suit everyones riding style but it works for me on BT016's. I'm 120kg+ with gear so the riders weight will make a difference to what pressures you end up with.
 

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Below 28psi and its all over the road like a mad womans shit.;)
Well that's Brisbane scored off my list of aspirational holiday destinations.

Might also be worth considering the weight of the rider- some of the telly tubbies might be needing a lot higher pressures to counteract the veering, wobbling, fat induced death weaves.
 

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strange i am also fat about 95kg before i even look at clothing! and have had no problems at all even flat out on the autobahn
i have had the oe metzlers(shit but no weave) michelin pilot powers and 2tcs and now dunlop mutants even at 130ish kmh on bumpy back roads. i run the dunlops at 31 rear and 29 fromt on the michelins 29 front and rear
 

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Discussion Starter #9
Im well aware that Goldspeeds are never going to be stable but thats the tradeoff for the epic levels of grip. And 85mph is fine for me, i get bored of straight lines very quickly. But 65-70 is a bit low.
 

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strange i am also fat about 95kg before i even look at clothing! and have had no problems at all even flat out on the autobahn
i have had the oe metzlers(shit but no weave) michelin pilot powers and 2tcs and now dunlop mutants even at 130ish kmh on bumpy back roads. i run the dunlops at 31 rear and 29 fromt on the michelins 29 front and rear
95kg isnt fat, your just big boned like me :D Not sure why it needs more tyre pressure but it works. Cant find much info on setting these bikes up so its trial and error.
 

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Im well aware that Goldspeeds are never going to be stable but thats the tradeoff for the epic levels of grip. And 85mph is fine for me, i get bored of straight lines very quickly. But 65-70 is a bit low.
Fookin tell me about it :mad:, after endless feckin about with sus settings and pressure's and anything else you can mention, I thought I'd cracked it with my Goldspeed front .. but sometimes its not too bad upto say 85, then other times like today .. its absolutly shite !! ... and I have finally had enough of the bloody thing :mad: ... soon as I get payed, it's comin off so I can ride as fast as I want to before the summer disapears :rolleyes:

I've just priced up a Michelin Power One (prob the softest road legal tyre around ??) so may give that a go !
 

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95kg isnt fat, your just big boned like me :D Not sure why it needs more tyre pressure but it works. Cant find much info on setting these bikes up so its trial and error.
the 690 is undersprung for us "big boned lads". with the dunlops i have all std (rear preload ,front preload and ride hight ) i have just added 2clicks of comp and rebound all round
with the michelins i had the forks dropped (second line showing and more rear preload 30 mm static sag) std is 35 ie 12mm of preload
the screen makes 160kmh plus i little weavy but its not a problem
i have a 07 prestige the later SMR had some suspension changes ie shorter spring 220mm instead of 230mm but the same rate and trave l(210 mm) . ktm recomend 27 mm of static sag for the SMR
there are for the SMR different springs front and rear . front is i think a .56kg mm (std .52) and same length and rear a 70 nm (std 65) or a 75 nm which is the soft spring for a smc/ enduro
my ktm dealer quoted me about 220 euros for front and rear but i am not sure what difference the length would make
"fat boy chris"
 

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Discussion Starter #13
You need to find some better roads motul. seriously. high speed is boring. Its the sub 60mph corners that SM's are all about and for that kind of riding the goldspeeds are nothing less than epic.
 

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You need to find some better roads motul. seriously. high speed is boring. Its the sub 60mph corners that SM's are all about and for that kind of riding the goldspeeds are nothing less than epic.
Thanks for the info leanover. It gives me something to work with now. Wailingalleycat is on the ball. Most of my riding is back roads and goat tracks with 20-40kmh corners headin into the hills. Had a ZX10 for a few years but nowhere near as much fun through the twisty stuff and cops are gettin manic on speeding now.
 

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You need to find some better roads motul. seriously. high speed is boring. Its the sub 60mph corners that SM's are all about and for that kind of riding the goldspeeds are nothing less than epic.
Agreed mate, thats always been my angle on it, and I have so much confidence in the Goldspeeds below 70 its unreal ... I am also surrounded by tight back roads here in the sticks which I take full advantage of every weekend ;), but I also have access to some tight roads ideal for an SM that allow upto 80 - 85mph cornering (if ya balls are big enough and ya moto isnt trying to kill you) , one in particular I only really realised just how good it was a few weeks back :eek:, and I have been hunting anything on two wheels there ever since LOL ;), but once the red mist decends, and I find a power ranger that seriously wants to play, and the speed starts to rise I'm all over the feckin place and have to back off :mad: (no doubt lettin the sportsbike pilot think he's just wupped a moto in its own back yard !! .. and I cant have that !) ...
 

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Discussion Starter #18
I found that sliding back on the seat a bit and leaning over the front gets me another 5mph+ before the weave starts. It isnt as bad as it sounds in that the nice thing is it starts very slowly so you can feel it starting to weave and ease off.

As for the weight, i have a hypermetabolism so take about 6-8000 calories a day just to stay at 50kg, have been on some crazy drinks before but just felt like shit so prefer to be thin. Its all about the power to weight ratio anyway!
 

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I have read many threads on the Goldspeed 'Death Weave' on this forum and had a very similar problem with a set of Street Sport Ultras i bought recently.

So, i worked on the tyre pressures and arrived at 22psi front & rear as that works for my style of riding and weight (approx 79kg).

I then went about checking and setting the Static Sag and Rider Sag - and after tinkering slowly i have almost removed it now.

Next step was to drop the forks through by 1mm, again slowly slowly and this has also made a difference.

I am nearly there now, but I am not giving up as the grip from these tyres is awesome in my opinion and rather then throw the towel in and buy another front or rear I want to try and work through it.

So, i suggest you check your Static and Rider Sag, especially if you say you are 90ish kg as the bike is set as std for a 75kg person.

Its a long slow process, but lots of riders forget to spend the time, and if need be the money on getting your suspension set up properly, they can justify £500+ on exhausts and other bling stuff but forget the critical stuff like suspension set up and a decent set of tyres, again, in my humble opinion.

You may have to get a stiffer spring, but I'm no expert, but perhaps ask someone like K-Tech who specialise in suspension.

Cheers

WB :)
 

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I havent thrown in the towel as such (I've spent a couple of months with the Goldy) and will keep it for Autumn/ early spring times, but at the mo, when the weather is warm and the roads are fast, I'm gunna get either a Mich Power One "soft", or a Diablo Supercorsa "SC0" (super soft) - only thing is, the Pirelli is £145 for a front !!!! :eek:)
 
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