Probably a topic beaten to death...

[Walter Sobchak]

Each to their own and all but what has someone done to that poor RC30 .

I really like the new RSV4, have thought about upgrading to one but after the waiting times for bits for my current one last year I think this will be my last Aprilia for a while.

I use 34F 36R on mine.

[Tango13]

O/P, Just how knackered is your suspension?

Last Sunday I was out in similar conditions running 36f/42r with 80 lbs/ft or 110nm of torque from 4,000rpm to 9,700rpm and I had zero problems with grip. Even in much cooler conditions the rear has only ever let go once and that was more of a gentle drift than a 'slip'

[King Herald]

julian64 said:

2.38-2.45 bar.

So I tend to run my bike at 30psi cos its the big figure on the very small dial I use, and check the rims aren't touching the ground when I sit on the bike. Then I'm good to go.

I love the way some people bandy around tiny fractions of a bar, like it is some surgical procedure and they are filling their tyres with nitrogen, in a climate controlled sterile zone, to be used on an indoor air con racing track.

[julian64]

Farlig said:

julian64 said:

2.38-2.45 bar.

Can I just say I love your enthusiasm.

The above figure equate to 34.986 psi to 36.015 psi. You are specifying the pressure down to 0.15 psi.

Ehh no, not quite; you´re taking what is an already higher resolution measurement of pressure & quoting it to three decimal places.
When measuring in bar, if you quote only one decimal place the resolution is not fine enough.
ie going from 2.3 to 2.4 bar is the same as going from 33.4 psi to 34.8 psi or rounded 33 to 35 psi, certainly sufficient to make a difference.
So measuring in bar, one must quote 2 decimal places to achieve a sensible resolution, whereas measuring in psi, there´s no need to use more than one decimal place, if that.
(Oh & your conversion factor is wrong... 1 bar = 14.5038 psi => 2.38 bar = 34.519 psi & 2.45 bar = 35.534 psi)

I think you need a whoosh parrot. My post was based on fag packet 14.7 psi = 1 bar. I didn't look it up because it doesn't matter. It was intentional designed to highlight the idea that there is a different between precision and accuracy. People on this thread are being incredibly precise to the point of ridicule but have no concept of their accuracy in getting pressure into a wheel.

You on the other hand come to correct my maths down to one ten thousandth of a psi when your foot pump could probably only be 'accurate' to 2-3psi despite the 'precision' on your gauge.

And that completely bypasses the question of whether one of you could actually tell the difference in riding with a change of 5psi which I would be willing to bet none of you could in any sort of blind trial.

So ........whhhhhoooooshhhhhhh

[moanthebairns]

tight5 said:

Ho Lee Kau said:

I felt the rear stepping out momentarily
It was a warm (15C+) day and dry

Were your tyres up to temprature ?
Cold tyres don't work too well !!

Pressures from the manual for me.

Would a few psi even cause a "stepping out" issue.

I mean I've had a near enough high side in the rain on st tyres, on greasy roads, cold tyres, fked tyres and on the track....

And all of these were rider error (too much throttle/lean asking too much etc), or/and cold tyres.

Would a few psi cause "stepping out". How bad a stepping out are we talking here, out your seat, balls off the tank, buy a lottery ticket or the bike telling your "WARNING, WARNING, I'm getting pretty fed up being a motorbike, I'm just letting you know I'm thinking about turning myself into a scud missile if you keep ham fistedly applying that throttle you clown".

[308mate]

moanthebairns said:

tight5 said:

Ho Lee Kau said:

I felt the rear stepping out momentarily
It was a warm (15C+) day and dry

Were your tyres up to temprature ?
Cold tyres don't work too well !!

Pressures from the manual for me.

Would a few psi even cause a "stepping out" issue.

I mean I've had a near enough high side in the rain on st tyres, on greasy roads, cold tyres, fked tyres and on the track....

And all of these were rider error (too much throttle/lean asking too much etc), or/and cold tyres.

Would a few psi cause "stepping out". How bad a stepping out are we talking here, out your seat, balls off the tank, buy a lottery ticket or the bike telling your "WARNING, WARNING, I'm getting pretty fed up being a motorbike, I'm just letting you know I'm thinking about turning myself into a scud missile if you keep ham fistedly applying that throttle you clown".

Or a few inches across a manhole cover that felt like a lot?

[Rawwr]

308mate said:

a few inches across a manhole

[STe_rsv4]

Rawwr said:

308mate said:

a few inches across a manhole

[Biker's Nemesis]

Rawwr said:

308mate said:

a few inches across a manhole

Bummer.

[moanthebairns]

Why is it bikers would go in a car, get a bit of understeer or oversteer and think, oh at the limits there back off. Right back on it ah fk it.

But when the bike gives them a signal of loss of traction due to you riding like a berk, fk my bikes broken, not enough air in the tyres, too much, they are gone, its the suspension, oil. I'm not for a second saying that sometimes this isnt the case but why do we all think that....

[Biker's Nemesis]

I don't think that unless I've misread the tyre pressure gauge and overinflated my rear tyre because I didn't put my glasses on.

[moanthebairns]

Biker's Nemesis said:

I don't think that unless I've misread the tyre pressure gauge and overinflated my rear tyre because I didn't put my glasses on.

He said lying on his driveway with his R1 on top of him and lost glasses.

[Farlig]

julian64 said:

I think you need a whoosh parrot. My post was based on fag packet 14.7 psi = 1 bar. I didn't look it up because it doesn't matter. It was intentional designed to highlight the idea that there is a different between precision and accuracy. People on this thread are being incredibly precise to the point of ridicule but have no concept of their accuracy in getting pressure into a wheel.

You on the other hand come to correct my maths down to one ten thousandth of a psi when your foot pump could probably only be 'accurate' to 2-3psi despite the 'precision' on your gauge.

And that completely bypasses the question of whether one of you could actually tell the difference in riding with a change of 5psi which I would be willing to bet none of you could in any sort of blind trial.

So ........whhhhhoooooshhhhhhh

I´m an engineer, I work with pressures & conversions every day - can´t help it. On the other hand you absolutely cannot quote figures to three decimal places when your conversion factor is one decimal place irrespective of what you are trying to convey - you´re wrong - my point is there are a fk load of people outside of the UK & USA who work in bar and to get a decent pressure resolution you HAVE to use 2 decimal places, so whoosh your imperial self dude...
And +/- 0.344738 bar (5 psi) can very easily be felt on a bike - but perhaps not by someone who doesn´t get counter-steering: whhhhhoooooshhhhhhh

[Birky_41]

Farlig said:

julian64 said:

I think you need a whoosh parrot. My post was based on fag packet 14.7 psi = 1 bar. I didn't look it up because it doesn't matter. It was intentional designed to highlight the idea that there is a different between precision and accuracy. People on this thread are being incredibly precise to the point of ridicule but have no concept of their accuracy in getting pressure into a wheel.

You on the other hand come to correct my maths down to one ten thousandth of a psi when your foot pump could probably only be 'accurate' to 2-3psi despite the 'precision' on your gauge.

And that completely bypasses the question of whether one of you could actually tell the difference in riding with a change of 5psi which I would be willing to bet none of you could in any sort of blind trial.

So ........whhhhhoooooshhhhhhh

I´m an engineer, I work with pressures & conversions every day - can´t help it. On the other hand you absolutely cannot quote figures to three decimal places when your conversion factor is one decimal place irrespective of what you are trying to convey - you´re wrong - my point is there are a fk load of people outside of the UK & USA who work in bar and to get a decent pressure resolution you HAVE to use 2 decimal places, so whoosh your imperial self dude...
And +/- 0.344738 bar (5 psi) can very easily be felt on a bike - but perhaps not by someone who doesn´t get counter-steering: whhhhhoooooshhhhhhh

Holy crap 5psi and you think you wouldn't notice it? 1-2 maybe but 5 you definitely would on road if you enjoy a more spirited ride. A commute or plod about maybe not

Simply put when my rear tyre was at 42 it was a great ride but kept stepping out on any angle when winding it on. I dropped it albeit a bit more than 5psi but the improvement was a big difference

[bennyboysvuk]

Walter Sobchak said:

I use 34F 36R on mine.

+1 For my R1. The lower pressures seem to provide more feel. Higher pressures on the rear seem to make it feel less planted.

[308mate]

Rawwr said:

308mate said:

a few inches across a manhole

Stop it! They can be very slippery at times...

[Biker's Nemesis]

moanthebairns said:

He said lying on his driveway with his R1 on top of him and lost glasses.

Awa ta fck wi ya.

It was Knockhil and you were there, I had 33 psi instead of 22 psi and I nearly had a few more embarrassing tales for you lot to tell.

We have a great big tyre pressure gauge now with big numbers, next step is brail.

[Ho Lee Kau]

MattOz said:

Tyre pressures.

I use 33psi front and 35psi rear, so what's that, 2.3 and 2.4 bar respectively. That's on my K7 GSXR1000, using Supercorsa SP's.

I have to try this on my K6.
I have Racetec K3 RR on it now, switched from SC SP as those wear too damn fast (especially front sides, as I ride K6 only on uphill-downhill hairpins).
I have 2.3 front and 2.6 rear, cold.

[Farlig]

Birky_41 said:

Holy crap 5psi and you think you wouldn't notice it? 1-2 maybe but 5 you definitely would on road if you enjoy a more spirited ride. A commute or plod about maybe not

Simply put when my rear tyre was at 42 it was a great ride but kept stepping out on any angle when winding it on. I dropped it albeit a bit more than 5psi but the improvement was a big difference

Hey don´t get at me dude - I said "+/- 5 psi can very easily be felt on a bike" - It´s the non-believer in counter steering that doesn´t think anyone will notice (!!)

[mckeann]

Ho Lee Kau said:

I have to try this on my K6.
I have Racetec K3 RR on it now, switched from SC SP as those wear too damn fast (especially front sides, as I ride K6 only on uphill-downhill hairpins).
I have 2.3 front and 2.6 rear, cold.

You know the K3 and the SP are basically the same tyre yeh??