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T: Fuel Tank New Project

timetraveller

Well Known and Active Website User
VOC Member
Hi Erik, do you know which springs you have? To get some idea of whether there is too much spring pre-load you need to get the bike up to about its final weight and then look at the angle of the lower link. With the bike sitting on its own wheels the front of the lower link should be just below the horizontal, that is down at the front by, say 5 - 10 mm. Then when you sit on the bike and take your feet of the ground the front of the lower link should move upwards by, say, 5 - 10 mm. If it does not do that then there is too much pre-load and you can shorten the springs by about 6 mm and try again. If it really does not move significantly then my guess is that you have the wrong springs. I check the spring rate of the front spring by leaving them in their spring boxes and putting the bottom of the box on top of a piece of wood on some bathroom scales. The wood is there just to protect the scales. I then load a weight on to the top of the spring box and note how much the box has compressed. I try to do this by adding weights progressively. It does not matter if you do not know the exact weight being added as that shows up on the bathroom scales. In my case I do this by putting the top of the spring box into the ball hitch on the front of a trailer but if you have a more sophisticated system then that would be easier and better. If you have enough weight then with the 30 lbs/inch springs you should get a reduction in height/length of about 78 mm for a loading of 90lbs/41kgs.
 

timetraveller

Well Known and Active Website User
VOC Member
I doubt it Chris. Perhaps removing some of the packing if needed but you are still up there with the sturdy brigade. Feedback is always useful. I recently supplied a kit to a rider in Germany who is 18 stones and he will have to try the system out first to determine whether he has the correct combination of parts.
 

Marcus Bowden

Well Known and Active Website User
VOC Member
Last year I did my Speet brake with the Schellhaas conversion on my "A" Rap, otherwise, it quadruples the time in removing the front wheel and the balance beam is left rocking in the breeze. Bruce's question above I was also about to ask.
bananaman.
 

peter holmes

Well Known and Active Website User
VOC Member
Looking at the big hexagonal nut at the top and the threaded stud at the bottom, it looks like a spring box compressor to me, but I far prefer the front wheel Tommy bar windlass method. I think Tim just left you guessing!
 

erik

Well Known and Active Website User
VOC Member
You are Right ! It is a spring box compressor tool.The Price of this tool is About 3€.If you loose the washing line twice it is cheeper.Regards Erik
 

Bill Thomas

Well Known and Active Website User
VOC Member
Eric I like your front tyre, Almost ribbed ?, I think Vincents like ribbed ?.
Can you give us details, and what you use on the back.
Cheers Bill.
 

bmetcalf

Well Known and Active Website User
VOC Member
You are Right ! It is a spring box compressor tool.The Price of this tool is About 3€.If you loose the washing line twice it is cheeper.Regards Erik
How does it attach at the top and bottom?
 

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