Calling Lahar And Balfa Owners!

Postby dh_winner on Sat 19/May/07 11:22am

Im workin on a bit of a project and in after some measurements to see if im in the ball park. Those of you out there who own a balfa, Lahar or any other high pivot bike could you please after the measure from your crankbolt to the center of the top pivot.
Im particularly interested in Lahars.
Cheers :thumbsup:
dh_winner
Member for: 18 years 1 month

Postby giantdh on Sat 19/May/07 12:16pm

I own a balfa! its 180mm
giantdh
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Postby MVink on Sat 19/May/07 1:04pm

It's 7inch on Balfas, hence the 7 in BB7.
MVink
Member for: 16 years 10 months

Postby biGHiT-bOy on Sat 19/May/07 7:41pm

Why don't you give Aaron at Lahar a hollah?
biGHiT-bOy
Member for: 15 years 6 months

Postby DropKick on Sat 19/May/07 8:22pm

"Hey Aaron, just gonna steal some ideas, could you give me some measurements"
DropKick
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Postby Wobbler on Sat 19/May/07 9:13pm

A side on picture based on a wheel is this big etc should give you a pretty good idea about the height of them.
Wobbler
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Postby dh_winner on Sat 19/May/07 10:09pm

cheers for the blafa measurements. Any lahars out there? i would prefer not to estimate off pics or risk pissing off manufacturers.
dh_winner
Member for: 18 years 1 month

Postby NightKid on Sun 20/May/07 2:49am

Dave Scandrett and a couple of other chchers have Lahars, next time you see them up in the hills why don't you ask if you can have a looksie?
NightKid
Member for: 15 years 7 months

Postby Wobbler on Sun 20/May/07 9:15am

Wouldn't the distance fore and aft of the cranks also be important? If you need it accurate enough where you cant estimate then you'll need that also.
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Postby El_DHer on Sun 20/May/07 9:22am

there was onein post your ride a while ago
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Postby ClenchedTeeth on Sun 20/May/07 11:06am

dh_winner wrote: i would prefer not to estimate off pics or risk pissing off manufacturers.

Wouldn't you only want a rough estimate anyway? I mean unless you're copying their design 100%, there's not much reason to need it exactly right, is there?
Anyway you could get a hold of an owner's manual pdf, which will have a nice technical drawing of the frame, and it will list sizes like top tube length etc that will let you calibrate the scale.
ClenchedTeeth
Member for: 14 years 2 months

Postby JohnnyC on Sun 20/May/07 5:40pm

dh_winner wrote: cheers for the blafa measurements. Any lahars out there? i would prefer not to estimate off pics or risk pissing off manufacturers.


The DHV uses a pivot point that gives the rear wheel a wheel path parallel to the head angle of the front wheel at bottom out. So the tangent of the wheel path when bottomed out would be about 62-63 degrees. This keeps the wheel base more or less constant rather then shortening as the suspension compresses. You should be able to work it out from there but also search through the forums on www.ridemonkey.com where Aarons posted all the technical theory behind it, just search for Lahar.
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Learn About Suspension Geometry?

Postby scoobydoo on Sun 20/May/07 11:01pm

Don't know what your project is but this may be helpful.

If you read and understand this you will be able to design a rear suspension system that squats, jacks or is unaffected by pedalling and weight transfer forces. It's up to you as the designer, this is the pedalling geometry. Bump absorption is a seperate issue, i'm sure most people who have ridden a high pivot bike will agree bump eating is better if your pivot is high.

Any questions?
chain force email copy.jpg
Describes jacking effect from traction force with chain force correction
POM vs WT email copy.jpg
describes relationship between weight transfer squat and traction force jack.
weight transfer email copy.jpg
describes squatin effect from weight transfer
finished 2.jpg
My high pivot bike
scoobydoo
Member for: 15 years 7 months

Postby Butch on Sun 20/May/07 11:35pm

Whoa. :eh:


Physicsy goodness?
Butch
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RE: Learn About Suspension Geometry?

Postby Whoops on Wed 23/May/07 9:30am

scoobydoo wrote: Don't know what your project is but this may be helpful.

...

Any questions?



Champion.
Whoops
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Member for: 14 years 10 months

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