ADVrider

Go Back   ADVrider > Bikes > Thumpers
User Name
Password
Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 04-27-2010, 07:46 PM   #1
RiDR OP
The Himalayan what?
 
RiDR's Avatar
 
Joined: Mar 2007
Location: 45.55397,-78.59676
Oddometer: 592
unexpected COOL side effect / Thumper Geometry

I wasn't expecting this at all...

I needed some new springs up front and rear to handle an eight gallon fuel tank and some metal panniers loaded.
Deciding what spring to get out back was a bit of a dilemma as the racetech spring calculator said I needed 7.82 Kg for my weight alone, and 8.47 kg with the metal panniers... so I opted for the 8.1 Kg which was right in between.

Keeping in mind that:

Race Sag should be around 4"
Static sag should be between 1 - 1 1/2"

With the panniers on, I set the sag and ended up with 3 3/4" race sag and 2" static sag. Without the panniers this equals 3 1/2" race sag and 2" static.

In other words, I really had to preload the rear spring (which will have to suffice until I get real suspension), and from what I've read, with the ride height being taller, not only did the weight shift forward, but the swingarm angle makes for a shorter wheelbase.

The bike takes corners, twisties unreal and is really flickable. At first I thought wow, I'm a great rider but realized something was up when I went through a sweeper at speeds that I would have never attempted before... I always thought it was the rider, but in this case it's the bike!

On the downside, I'm noticing some crawling speed imbalance where it's hard to hold a straight line in stop and go traffic, less traction on the rear wheel for acceleration, skipping / loss of traction offroad over bumps, and where once I could lock the rear wheel and slide straight line to a stop, the wheel is harder to lock and will push out to one side... but I may leave it like this for a while, I'm having too much fun to care
RiDR is offline   Reply With Quote
Reply

Share

Thread Tools Search this Thread
Search this Thread:

.
Display Modes

Posting Rules
You may not post new threads
You may not 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 On

Forum Jump


Times are GMT -7.   It's 02:53 AM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ADVrider 2011-2014