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Thread: Suspension/ Tire wear help needed Reply to Thread
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  Topic Review (Newest First)
10-04-18 19:18
jscottyk
Quote:
Originally Posted by MGFChapin View Post
Because for most people it doesn't matter. Since you can't use 1/2 of a chain link, it's tricky to get the axle where you want it and have proper chain slack.
*WA-BAM*

That was real-world knowledge smacking into theory!

Good stuff. Thanks!
10-04-18 18:46
MGFChapin
Quote:
Originally Posted by jscottyk View Post
Iíll start logging changes to my swingarm length and the resulting changes to handling. This seems to be one area of chassis setup that I havenít seen a lot of discussion about here.
Because for most people it doesn't matter. Since you can't use 1/2 of a chain link, it's tricky to get the axle where you want it and have proper chain slack.
10-04-18 18:06
jscottyk
Quote:
Originally Posted by tottenham12712 View Post
I dont have the numbers written down as it was done on a rig at a shop. Dont compare eslicks bike to ours, they were not running stock triples. If you are running triples with better numbers then you have the flexibility to move the rear around as you please.

Excellent comments and advice. I failed to note, Iím running AP triples and linear link.

Iíll start logging changes to my swingarm length and the resulting changes to handling. This seems to be one area of chassis setup that I havenít seen a lot of discussion about here.



Sent from my iPhone using Tapatalk
10-04-18 16:34
tottenham12712
Quote:
Originally Posted by jscottyk View Post
@tottenham12712 what is the swingarm length you are aiming for?

I was looking at Attack Peformance setup numbers for Danny Eslick's bike and noticed they were running the rear wheel forward in the adjustment range. I assumed they were doing this (along with particular counter sprocket and final gear) to get a swing arm angle that best promotes wheelie control.

IIRC, that setup (for a track like Laguna Seca) was swingarm length of 582mm and gearing of 14/44 and a 114 link chain.

I dont have the numbers written down as it was done on a rig at a shop. Dont compare eslicks bike to ours, they were not running stock triples. If you are running triples with better numbers then you have the flexibility to move the rear around as you please. I run a stock class bike so I can only adjust what I have, moving the rear backwards stabilizes the bike by making it longer. I run 16/48 personally, that seems to fit really well at all the tracks I run on the east coast. With stock triples, making the bike longer does require a bit more muscle to get it to go through a chicane but overall I find the bike is easier to ride fast as it just feels more stable. As a stock class bike, I dont find the front lifting in an uncontrolled fashion. If I do need to bring it down I drag the rear brake a touch and thats all it needs. When you really start poking the engine with a stick I could see that mattering a bit more. For even more context I launch the bike at 8k, with a fast but smooth release the front will lift a few inches and hold until I get to the top of 2nd gear and Im usually always getting one of the best starts on the grid.



I dont change geometry between tracks, im not fast enough for that. I do have different baselines for settings however. I stick to what works for me and leave it, as im no where near fast enough for these differences to matter as long as I have a bike im 100% confident on at this level its 100% the rider not the bike. There are dudes out there running clapped out shit boxes and winning on them. I've given this setup advice to a few riders now and they all come back with the same statements on how it rides. If you can run the AP adjustable triples then you can go in an entirely different direction that will 100% be better.
10-04-18 12:52
jscottyk
Quote:
Originally Posted by tottenham12712 View Post
Your rear axle is too far forward, it needs to be all the way back. Like this:
@tottenham12712 what is the swingarm length you are aiming for?

I was looking at Attack Peformance setup numbers for Danny Eslick's bike and noticed they were running the rear wheel forward in the adjustment range. I assumed they were doing this (along with particular counter sprocket and final gear) to get a swing arm angle that best promotes wheelie control.

IIRC, that setup (for a track like Laguna Seca) was swingarm length of 582mm and gearing of 14/44 and a 114 link chain.
10-03-18 19:40
ShaLaMae Forgot my rear axle and front tire picture
The front has four track days on it

The chain also needs to be tightened up seeing how that was the virgin voyage and two track days of pure trashing.

I watched videos of my riding on Sunday my second day there. What a difference in confidence over wheelie hill there.
Before she would wheelie over and then again soon after I would tach out and switch to fourth.

After totally stable no twitchiness and less to worry about. Pure love.

I need ride height to carve a better turn in and out.

I’m saying this only to bring her to perfection.

What you were saying about the K-Tech front and rear is making me drool.
10-03-18 19:22
ShaLaMae Just a few pictures of my rear tire

This is with 12 out from full clockwise +

17 out full clockwise +
09-27-18 16:19
ShaLaMae
Quote:
Originally Posted by UK_Race_Support View Post
Quote:
Originally Posted by ShaLaMae View Post
My answers are in the quotes above. It’s a little confusing sorry. I didn’t think it would look like that.

I’m posting pictures of the spacers axel and linkage.
The axel in relationship to swing arm is 22-1/4” even on each side

I also emailed UK Race Support last night before bed. They emailed back 3AM their time. WTF are they doing at that time. But their support seems on the ball. As long as they are not Honking lines at that Hr. Cocaine is a hell of a drug!
We don't sleep [IMG class=inlineimg]https://www.triumph675.net/forum/images/smilies/organizedsmilies/1/laugh.gif[/IMG]
Your costumers support was killer thanks for your info and help.
09-27-18 16:18
ShaLaMae
Quote:
Originally Posted by tottenham12712 View Post
Quote:
Originally Posted by ShaLaMae View Post
Okay update time. I just got back from NYST PIG ROAST. I’m spent. Road Saturday and Sunday.

So I got a new chain and ring setup. 520 -1 +1 (15,48) I should have gone 49 but whatever.

I lowered my rear by two and a half mm. I(removed the washer as my side bight spacer). I lengthen my wheel length. Pulled the wheel back in the swing arm. I have 117 links I think. I started playing with clickers. Started with.
10 out compression

12 out rebound.

It was better but rebound was slow.
I kept taking some out by one every session.
At one point I was 18 out and still had leading edge issues.

BUT my tearing was almost gone.
Still had some but was much better than the last two times out.

This was too much out . So I put 3 in
And two out of comp.

This was a good setup for me.

I have to take some pictures and I will post them when I have time.

My next job is triples and a Computrack check.
Stay away from computrack. Guy is all over the place and has made some really bad mistakes putting peoples equipment back together.

Post some photos of the tire wear and the sipes, also of the rear swing arm location. 2.5mm and the swing arm being pushed back is getting way closer to being correct but you still need to drop a few more mm, I would imagine thats why the tear is just hanging around a bit.

How many miles or hours are on the rear shock since it was last serviced? Depending on how fast you are the rear shock can start going off within 2-4 days of riding. You should be servicing the rear at least once per year if you are at the track several weekends a year.

How did it turn?..

- When you turned in was it a single input and then on rails to apex? Did it feel like it wanted to push wide? Did it feel like it wanted to fall into the corner?

- When you opened the throttle did the bike go where you wanted? Did it want to run wide? Did it feel like you needed to add steering input to get the bike to run wide?


EDIT: Triples are not required unless you are chasing that last 1 second of time at a track during a race, get your bike working properly before changing more stuff otherwise you will be chasing setup forever. Secondly if you swap triples you will no longer be eligible for stock class racing if you plan on doing that.
So the GMD stuff I’m well aware of. I’m looking for it to be measured to see how the #’s look.
I completely removed the ride height spacers. So the shock height has as low as it can be.
The forks are 3mm from flush.
The shock was serviced in April. It has about 500 track miles on it about 7 track days.
Same for the forks.
Turn in is slower especially when I’m not at my typical pace .
I’m an ex LRRS Expert and was a top rider when I did race a lifetime ago. I’m slower now but can be fast usually top 5 fast guys on any given track day . I’m saying this only as a pace baseline.
I was having confidence issues in the front end mid corner on bumpy sections where the tarmac was torn from cars.
Aside from the sipes slightly wearing high on the leading edge my tires were night and day compared to the last two times out.
Your help was very informative and I really appreciate the help.

I’m going do a refresh on the shock and forks hopefully before winter.
I’m hoping that will help the tire wear.
The triple tree is not really needed but more for raising the rear up and more front end feel mid corner.
I tuck the front when I get the pace up to a “race pace” . I have yet to fall because I save it with my knee.
The faster I go the better the handles but the front limits my pace. I fall into a trap when I’m on . She only handles well when I push her and the front makes me nervous.

The whole package was a tad slower turning in and out but I could overcome that with riding her on a slightly earlier turn in line with more run out space.
I will say over the hill it was much more stable. No hint of wheeling or nervous front lifting. That’s the biggest positive about this setup.
09-24-18 11:32
UK_Race_Support
Quote:
Originally Posted by ShaLaMae View Post
My answers are in the quotes above. Itís a little confusing sorry. I didnít think it would look like that.

Iím posting pictures of the spacers axel and linkage.
The axel in relationship to swing arm is 22-1/4Ē even on each side

I also emailed UK Race Support last night before bed. They emailed back 3AM their time. WTF are they doing at that time. But their support seems on the ball. As long as they are not Honking lines at that Hr. Cocaine is a hell of a drug!
We don't sleep
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