Daytona Handling Issues - Page 4 - Triumph675.Net Forums
General 675 discussion Anything related to the Triumph 675 model(s), and miscellaneous motorcycle talk.

Reply
 
Thread Tools Display Modes
post #31 of 46 Old 11-27-12, 18:50 Thread Starter
[Terry]
Member
Threadstarter Threadstarter
 
Join Date: Jun 2009
Location: New Zealand
Posts: 202
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via MSN to [Terry]
Quote:
Originally Posted by MGFChapin View Post
Do you know what your sag was on Karl's bike? I'm sure you're aware that the stock spring is meant for someone well over 100 kilos. I'm only 68 kg and it felt like barebacking a Golem. I'd say getting the right spring for yourself is the first step.
THANK YOU!! Finally someone has confirmed this for me That's exactly what I felt like on the stock spring. I'll check my sag on Karls bike next time I see him and update. It's either too hard or too soft atm.

I'm normally between 67 and 69 kg so I'd be same weight as you. Although I suppose you're running a completely different shock too.

Any recommendation on a spring?

Project Digital
Freelance Website Design & Development
http://www.projectdigital.co.nz
[Terry] is offline  
Sponsored Links
Advertisement
 
post #32 of 46 Old 11-27-12, 19:13 Thread Starter
[Terry]
Member
Threadstarter Threadstarter
 
Join Date: Jun 2009
Location: New Zealand
Posts: 202
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via MSN to [Terry]
OK so I've just been on Race Tech's website looking at springs. The recommended spring rate for me is 9.6kg/mm.

The Ohlins spring I have is 9.5kg/mm so why is it that I cannot get the correct sag using the stock shock and Ohlins spring? The Racetech spring recommended is 8mm taller in height than the Ohlins but that's nothing?

I'm so confused now!!!!

Project Digital
Freelance Website Design & Development
http://www.projectdigital.co.nz
[Terry] is offline  
post #33 of 46 Old 11-27-12, 19:17
MGFChapin
Senior Member
 
MGFChapin's Avatar
 
Join Date: Aug 2006
Location: Seattle
Posts: 5,906
Thanks: 1
Thanked 30 Times in 27 Posts
Sure you're measuring sag correctly? How are you doing it?

I ordered an Elka custom made for my weight, and I don't remember the spring rate. 9.5 sounds about right though.
MGFChapin is offline  
post #34 of 46 Old 11-27-12, 19:31 Thread Starter
[Terry]
Member
Threadstarter Threadstarter
 
Join Date: Jun 2009
Location: New Zealand
Posts: 202
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via MSN to [Terry]
Quote:
Originally Posted by MGFChapin View Post
Sure you're measuring sag correctly? How are you doing it?

I ordered an Elka custom made for my weight, and I don't remember the spring rate. 9.5 sounds about right though.
I hope I'm not doing it correctly! That would solve a lot of problems haha!

I marked a point on the rear fairing directly above the rear wheel. I then got a helper to lift the rear with me and another to measure from the axle to the point. This is L1

I then kitted up, jumped on the bike, got one helper to hold the front and the other to lift and slowly lower the rear so it settled and then measured again. This is L2

I then did the same as above but got the helper to push down on the rear and let go slowly and then measure. This is L3.

L3 and L2 were averaged to account for any stiction and this we'll call L4.

L1 - L4 is the sag....

Is that correct??

Project Digital
Freelance Website Design & Development
http://www.projectdigital.co.nz
[Terry] is offline  
post #35 of 46 Old 11-27-12, 19:58
MGFChapin
Senior Member
 
MGFChapin's Avatar
 
Join Date: Aug 2006
Location: Seattle
Posts: 5,906
Thanks: 1
Thanked 30 Times in 27 Posts
Yeah your method & math are perfect, unfortunately, haha! I'll dig around for the article & let you know.
MGFChapin is offline  
post #36 of 46 Old 11-27-12, 19:59 Thread Starter
[Terry]
Member
Threadstarter Threadstarter
 
Join Date: Jun 2009
Location: New Zealand
Posts: 202
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via MSN to [Terry]
Quote:
Originally Posted by MGFChapin View Post
Yeah your method & math are perfect, unfortunately, haha! I'll dig around for the article & let you know.
Haha thanks! Much appreciated!

Project Digital
Freelance Website Design & Development
http://www.projectdigital.co.nz
[Terry] is offline  
post #37 of 46 Old 11-27-12, 21:17
MGFChapin
Senior Member
 
MGFChapin's Avatar
 
Join Date: Aug 2006
Location: Seattle
Posts: 5,906
Thanks: 1
Thanked 30 Times in 27 Posts
OK, I can't find the geometry article, but I have 3 or 4 others that, combined, I think will help you out. PM me your e-mail address and I'll send them as attachments.
MGFChapin is offline  
post #38 of 46 Old 11-27-12, 21:30 Thread Starter
[Terry]
Member
Threadstarter Threadstarter
 
Join Date: Jun 2009
Location: New Zealand
Posts: 202
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via MSN to [Terry]
Quote:
Originally Posted by MGFChapin View Post
OK, I can't find the geometry article, but I have 3 or 4 others that, combined, I think will help you out. PM me your e-mail address and I'll send them as attachments.
Awesome! Thanks a million! Done!

Anyone know why I wouldn't be able to get the correct sag with the correct spring? Is there something such as rebound or compression that would affect it? I've added a spacer above the shock to the mount to increase ride height, would this affect it?

Project Digital
Freelance Website Design & Development
http://www.projectdigital.co.nz
[Terry] is offline  
post #39 of 46 Old 11-27-12, 22:20
Smoke
Senior Member
 
Smoke's Avatar
 
Join Date: Nov 2009
Location: France
Posts: 3,318
Thanks: 0
Thanked 1 Time in 1 Post
Perhaps the dogbone and suspension plates are mounted backwards.

Someone mentioned tyre pressure, I didn't see your answer to that, same for your buddy's fork height, same for the tyres, they can have drastic effects.

You will never have exactly the same feeling on two bikes, but stock should be your objective.

Lowering the bike makes it use more lean angle for the same corner, all other things being equal, lowering the front isn't something to be done lightly. You're describing a lack of confidence which could be down to twitchiness and lack of stability.

Chapin, as the rear shock sags under bike and rider weight, it isn't fully extended anymore, therefore preload affects its length, and ride height ;)

The slower you move, the more dangerous your bike is... I'll let you work out the conclusion from there

If you find wearing proper gear's too hot, you're just not fast enough !


Dual Desert Eagle EBB ? MER IL ET FOU !
Viendez nolifer avec nous sur le salon #Airsoft sur IRC !
Et jouer avec Ploubalairsoft entre le 22 et le 35
Smoke is offline  
post #40 of 46 Old 11-27-12, 22:43 Thread Starter
[Terry]
Member
Threadstarter Threadstarter
 
Join Date: Jun 2009
Location: New Zealand
Posts: 202
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via MSN to [Terry]
Quote:
Originally Posted by Smoke View Post
Perhaps the dogbone and suspension plates are mounted backwards.
Good point, I'll check. The triangles are on the right way round but I never checked the dig bone.

Quote:
Originally Posted by Smoke View Post
Someone mentioned tyre pressure, I didn't see your answer to that, same for your buddy's fork height, same for the tyres, they can have drastic effects.
Tyre pressures were checked and confirmed before our ride. We both have the exact same tyres too. Fork height started out as the same (both 6mm pulled through) and mine are now at 7.8mm.

Quote:
Originally Posted by Smoke View Post
You will never have exactly the same feeling on two bikes, but stock should be your objective.
Yea, I don't expect for them to be identical but the difference is astronomical. It's hard to explain how bad my bike is. Even 80% as good as his handles would be awesome!!

Quote:
Originally Posted by Smoke View Post
Lowering the bike makes it use more lean angle for the same corner, all other things being equal, lowering the front isn't something to be done lightly. You're describing a lack of confidence which could be down to twitchiness and lack of stability.
I'll maybe put the forks back to 6mm through but it's more the rear that I don't have confidence in. Front seems much better than the rear.

Project Digital
Freelance Website Design & Development
http://www.projectdigital.co.nz
[Terry] is offline  
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Triumph675.Net Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode


Forum Jump

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

 
For the best viewing experience please update your browser to Google Chrome