Some track day prep questions

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andyb said:
Have you never set you sag? Ride height ? Damping? .. feel we have been here before..
Click to expand...

Sag, rebound and damping were set by a track day organiser that apparently is very good at this sort of thing. He didn’t measure anything though.

Perhaps I should check it myself.

And I don’t think we have been here before.

Your reply does not actually address what might cause it though.
 
panibadboy said:
Send some photos, text description is often misleading
Click to expand...

IMG_0613.jpeg


IMG_0612.jpeg



Soft rear and possibly too hot for a soft, but not by much.
 
lol

exactly as I thought

there is absolutely nothing wrong here

you're not leaning enough to use the edge of the tire

until you start leaning properly, you dont even need to look at the edge


the rest of the wear looks okay
 
panibadboy said:
lol

exactly as I thought

there is absolutely nothing wrong here

you're not leaning enough to use the edge of the tire

until you start leaning properly, you dont even need to look at the edge


the rest of the wear looks okay
Click to expand...

So the bits that appear to be to the edge are just pushed out rubber and the clean parts are just where that rubber has come off? I thought it looked a bit odd as it was not consistent around the tyre.

As I’ve mentioned before, I’m leaning less as body position improves. I was doing 54 degrees before and I reduced that by 10 degrees while reducing lap times. I think part of not feeling comfortable hanging off a lot further is that I’d probably feel more secure in that position if I was going faster through the turns. Watching the recent videos I was picking up 10-20kph through various turns compared to previous visits and starting to feel more comfortable.

The pictures are from the right side of the tyre - the left has a couple of mm evenly around the tyre. I just thought it looked odd on the right side as it isn’t even/consistent.
 
spooky said:
So the bits that appear to be to the edge are just pushed out rubber and the clean parts are just where that rubber has come off? I thought it looked a bit odd as it was not consistent around the tyre.

As I’ve mentioned before, I’m leaning less as body position improves. The pictures are from the right side of the tyre - the left has a couple of mm evenly around the tyre. I just thought it looked odd on the right side as it isn’t even/consistent.
Click to expand...

once you start using the edge of the tire, it will look exactly like the rest of the tire.
the most important bit is that the rest of the tire looks good.
any issues with suspension often result in un-even wear 2-3cm above the edge, yours look good

1726085603179.png
 
spooky said:
I’m going to contact them. It looks like a great idea.

I was checking the bike over and noticed that the rear tire had uneven wear along the edge. It was to the edge, then slightly away, then back to the edge… I’m guessing this might be to do with rebound and compression? I have not seen this before. I also wonder about preload and I know that a lot of people of my weight, which varies at the moment between 87kg and 89 kg without riding gear, use different springs at the front and rear. The front was fine.
Click to expand...

Rehm usually goes to Cartagena, Bike Promotions to Andalucia/Almeria.
Both do Jerez, Portimao, Valencia - just different dates.

Cartagena is tricky on V4R - short track. Nice to practice body position but would deffo require to change gearing to be more comfortable.

Andalucia/Almeria are amazing.

20210402_193645.jpg


20210402_193653.jpg


Valencia is great as well

20210408_101441.jpg
 
panibadboy said:
once you start using the edge of the tire, it will look exactly like the rest of the tire.
the most important bit is that the rest of the tire looks good.
any issues with suspension often result in un-even wear 2-3cm above the edge, yours look good

View attachment 56466
Click to expand...

Good to know.

The stage I’m at now with lean angle actually reminds me somewhat of how nervous the bike felt in corners when I first started. As I went faster the bike felt better.

I have a feeling that I’ll feel more secure when hanging off further as I let myself carry more corner speed and momentum through turns. I’m still being far more cautious than I need to be. I noticed this particularly on the first-gear hairpin at Most - I added about 10kph to the lowest speed in that turn and it felt much nicer - I got more confidence as I increased entry speed, which was somewhat counter-intuitive.

I’ll make some enquiries about winter events and bike transportation. There’s no way I want to wait eight months to get back out and it would also be interesting to try some tracks other than Most and Brno, although I’m fortunate to have both of them a short drive away.

This weekend at Brno is looking like a complete washout for all three days…
 
I'm writing this to realize most Yanks on this forum don't even know how good is to do trackdays in Europe.

They drive their ...... Uhauls 8hrs one way to some ...... low-grade Cartagena-like tracks to "enjoy" 1 day there to drive back 8hrs.

In EU, you drop off your bike to an organizer, pay 50-100 add-on for transport to an event, fly in 2hrs a night before, have Paella Valenciana on arrival with some Roja, sleep a night and bang MotoGP-grade track for 3 days non-stop.
 
panibadboy said:
Rehm usually goes to Cartagena, Bike Promotions to Andalucia/Almeria.
Both do Jerez, Portimao, Valencia - just different dates.

Cartagena is tricky on V4R - short track. Nice to practice body position but would deffo require to change gearing to be more comfortable.

Andalucia/Almeria are amazing.

View attachment 56467

View attachment 56468

Valencia is great as well

View attachment 56469
Click to expand...

I’d like to try Valencia and Jerez. Portimao is apparently fun but harder to learn with lots of blind parts?

I’d love to try some of the other famous circuits as well but it would be great to do it when I’ve got to a better standard.
 
SuperDomestique said:
You have a bit of hot tearing just off the edge. Could go up a psi or 2
Click to expand...

its more complicated than that unfortunately.

its dunlop gp whatever its called slick, they are really sensitive to outside temperature and pressure.
plus it was at Silverstone GP back in days when they re-surfaced it so it was very abrasive. Cold outside too.

it ended up like this :
1726087734509.png



I stopped using dunlops after that, too much hassle with them
 
panibadboy said:
its more complicated than that unfortunately.

its dunlop gp whatever its called slick, they are really sensitive to outside temperature and pressure.
plus it was at Silverstone GP back in days when they re-surfaced it so it was very abrasive. Cold outside too.

it ended up like this :
View attachment 56470


I stopped using dunlops after that, too much hassle with them
Click to expand...

Yikes. Hot tear to delam. No bueno
 

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