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  #796  
Old 03-03-2017, 08:45 AM
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David Kirk David Kirk is offline
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Quote:
Originally Posted by Teletori View Post
Been drooling over these Terraplane bikes, and love the Stainless bikes where you can see the bautiful work up in the open.

Is it possible to get the old style bend on the Onesto fork, or is that a limitation of stainless steel?
"Old style bend?" I assume you mean with all the curve concentrated at the bottom?

If so then the answer would be no. The material won't allow for that type of bend.

dave
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  #797  
Old 03-03-2017, 08:49 PM
fa63 fa63 is online now
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Kirk Frameworks

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Originally Posted by David Kirk View Post




I think I have found my new dream bike...
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  #798  
Old 03-05-2017, 07:56 AM
Climb01742 Climb01742 is offline
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Originally Posted by David Kirk View Post
Onesto Terraplane for NAHBS in 10 days!

dave

Ain't nothing wrong with that. To echo others, large frames are usually challenged in the elegant department. Not this one. 11 on a scale of 1 to 10.
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  #799  
Old 03-05-2017, 03:04 PM
MauiHoss MauiHoss is offline
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Quote:
Originally Posted by David Kirk View Post
"Old style bend?" I assume you mean with all the curve concentrated at the bottom?

If so then the answer would be no. The material won't allow for that type of bend.

dave
Does that change the ride quality/dynamics and if so how?

After the teaser pics of the Onesto it's really nice to see the whole bike. Impressive that you took the time to place the wheels in the same orientation. Attention to detail -- the sign of a master.
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  #800  
Old 03-05-2017, 06:07 PM
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David Kirk David Kirk is offline
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Quote:
Originally Posted by MauiHoss View Post
Does that change the ride quality/dynamics and if so how?

After the teaser pics of the Onesto it's really nice to see the whole bike. Impressive that you took the time to place the wheels in the same orientation. Attention to detail -- the sign of a master.

The amount of rake the fork has of course contributes to the way the bike rides and handles but it's harder to nail down how the radius of the curve made to get that amount of rake changes the ride. The reason it's hard to nail down isn't obvious at first.

The fork blades pictured on the Onesto above are made from Reynolds 953 which, because it's so strong, can be made very thin and light....and the some of the needed stiffness of the blade is provided by the much larger diameter of the lower end of the blade compared to a "normal" blade. The hard material, thin tube walls and larger diameter mean that you can't put a tight bend in it....hence the very long radius bend.

On the other hand old school fork blades like Reynolds 531 were small in diameter with a much thicker wall and this allowed for a very tight bend if the builder so desired. Forks like this often had a butter smooth ride but it's hard to separate the fact that the tube is smaller in diameter (giving it more flex) from the tight curve (also contributing to flex). So since you can't have the tight bend without the small diameter, thick walled tube it becomes tough to test this out.

That said one could take an old, small and thick blade and make two forks with the same rake but with different radii bends and see what that does. I suspect that if you went to the extreme and used a super long radius on one fork and a super tight J-shaped curve on the other that you might be able to test for that difference on a load-displacement rig. Could you feel that on the road? I'll bet some could and others couldn't.

Sorry for the long answer - I didn't know how to make it short!

dave
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  #801  
Old 03-06-2017, 01:27 AM
Teletori Teletori is offline
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Thanks for the thorough explanation!
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  #802  
Old 03-06-2017, 11:24 AM
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David Kirk David Kirk is offline
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Something on the show Onesto was missing for me....red bar tape.

Now it's ready.

dave


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  #803  
Old 03-06-2017, 02:50 PM
Climb01742 Climb01742 is offline
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Two thoughts:

1. Bar tape now works better with saddle stripe.
2. Nice that most of your snow has melted.
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  #804  
Old 03-06-2017, 03:07 PM
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David Kirk David Kirk is offline
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Quote:
Originally Posted by Climb01742 View Post
Two thoughts:

1. Bar tape now works better with saddle stripe.
2. Nice that most of your snow has melted.
Thanks for the feedback.

It snowed again last night with more on the way tomorrow. It's a LONG way from over that's for sure.

dave
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  #805  
Old 03-07-2017, 10:09 AM
pncguy pncguy is offline
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... seamless fork crown ... gothic webs ... Onesto that looks like it would fit me ...

Damn. Starting to save my pennies today!

Last edited by pncguy; 03-07-2017 at 10:14 AM.
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  #806  
Old 03-07-2017, 10:10 AM
pncguy pncguy is offline
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Your Onesto dimensions?

By the way, Dave, what are the dimensions of your Onesto?
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  #807  
Old 03-07-2017, 10:38 AM
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David Kirk David Kirk is offline
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Originally Posted by pncguy View Post
By the way, Dave, what are the dimensions of your Onesto?
My bike is 60.5 x 59 with a 72° seat angle.

dave
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  #808  
Old 03-07-2017, 10:58 AM
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David Kirk David Kirk is offline
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Here's a few shots of the classic blue JK Special that will be in my booth at NAHBS this weekend. See you in SLC.

dave















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  #809  
Old 03-07-2017, 11:13 AM
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Keith A Keith A is offline
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Great work Dave.
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My '96 CSi & compact CSi
The Paceline . . . Enjoy the ride.
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  #810  
Old 03-07-2017, 04:28 PM
pncguy pncguy is offline
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Quote:
Originally Posted by woodworker View Post
It was like asking Clapton if he makes sounds by just pulling on some strings.
This may be the best and most amusing analogy I have heard in my life. Nicely done.
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