Motorized Bicycle Engine Kit Forum  

Sponsors



Go Back   Motorized Bicycle Engine Kit Forum > Motorized Bicycle > Board Trackers and Vintage Motorized Bicycles

Board Trackers and Vintage Motorized Bicycles Vintage enthusiasts share your board trackers and other vintage motorized bicycles ideas, builds and replicas here

Reply
 
Thread Tools Display Modes
  #41  
Old 12-26-2016, 03:05 PM
wret's Avatar
wret wret is offline
Motorized Bicycle Elite Member
 
Join Date: Feb 2014
Location: Maryland
Posts: 292
Default Re: What vintage fork will fit a 3-inch tire?

Thanks Gilbert. You are right. the true test will be to see it rolling. I'm happy that it looks good but "works good" is more important.

I had to take some time off yesterday obviously but I spent the last couple of days fitting the wheel/brake and clearing up some minor clearance and alignment issues. I'm very happy with the way it it works. I felt pretty smart for a moment, then reminded myself I had only copied a hundred year old design.

Painting now and then we'll see!
Reply With Quote
  #42  
Old 12-29-2016, 08:13 AM
wret's Avatar
wret wret is offline
Motorized Bicycle Elite Member
 
Join Date: Feb 2014
Location: Maryland
Posts: 292
Default Re: What vintage fork will fit a 3-inch tire?

Disassembled, painted, reassembled, and installed.







Attached Images
File Type: jpg left.jpg (266.3 KB, 102 views)
File Type: jpg Right.jpg (252.4 KB, 106 views)
File Type: jpg pieces.jpg (188.4 KB, 100 views)
File Type: jpg whole bike.jpg (270.5 KB, 100 views)
Reply With Quote
  #43  
Old 12-29-2016, 09:10 AM
indian22's Avatar
indian22 indian22 is offline
Motorized Bicycle Elite Member
 
Join Date: Dec 2014
Location: Oklahoma
Posts: 970
Default Re: What vintage fork will fit a 3-inch tire?

Wret your fork is a very impressive piece of work and complements your beautiful fabrication to date. Hope you've some good weather to test ride...looking forward to reports of your impressions. Best in the coming new year. Rick C.
Reply With Quote
  #44  
Old 12-29-2016, 05:48 PM
Mr.B.'s Avatar
Mr.B. Mr.B. is offline
Motorized Bicycle Elite Member
 
Join Date: Oct 2008
Location: Upper Mississippi River valley
Posts: 1,130
Default Re: What vintage fork will fit a 3-inch tire?

Pretty cool!
__________________
================================================== ====

First build video- http://alturl.com/9xptf. And Imgur album- http://imgur.com/a/WJjRl#0
Reply With Quote
  #45  
Old 02-21-2017, 04:20 PM
wret's Avatar
wret wret is offline
Motorized Bicycle Elite Member
 
Join Date: Feb 2014
Location: Maryland
Posts: 292
Default Re: What vintage fork will fit a 3-inch tire?

Well, we've had several very nice days here in Maryland and I've had a chance to ride around town a bit. I'm very pleased that I copied the design closely enough so that it articulates perfectly. It absorbs and dampens bumps extremely well and the reaction under front braking is manageable.

One thing I didn't like at first is that the static loaded position was at the bottom limit of travel. The main reason for this is the curve of the leaf springs is a little more than what I planned. I succeeded in straightening some of the bend with my vice but after bending the handle a few times I called it quits. I could have done better with a hydraulic press. I had anticipated this during fabrication and welded on some bump stops so that my grease cups would not be the travel limiters. I don't know how the original design limits travel. A couple of weeks ago, after a lot of thought, I used my already trashed power plain to make an aluminum wedge that I inserted at the back of my spring stack. This gave me a bit of slack at the bottom of travel.

Another slight modification I made was a rubber bumper inside the spring loop. I have seen that as an add-on for the original fork. It limits the flex of the loop, which is probably a weak point due to my heat treatment.

The other concern is that upward travel will bring the tire in contact with the spring stack. Hasn't happened yet. I've deliberately rolled over some pot holes but nothing too extreme. All in all I'm extremely happy with the function and the look. It's had a lot of guys doing double takes and snapping photos.
Reply With Quote
  #46  
Old 02-22-2017, 05:59 AM
indian22's Avatar
indian22 indian22 is offline
Motorized Bicycle Elite Member
 
Join Date: Dec 2014
Location: Oklahoma
Posts: 970
Default Re: What vintage fork will fit a 3-inch tire?

Wret I'd be surprised if you hadn't encountered some type of problems with a one off leaf fork build, trial and error is just a part of the process. I lift you up as a good example of building it and adjusting as you go. I've never built a leaf fork, but your experience is encouraging me to do so and I'll wager mine will require some adjustments or even redo's along the way as well.

Good work! Rick C.
Reply With Quote
  #47  
Old 02-22-2017, 09:36 AM
wret's Avatar
wret wret is offline
Motorized Bicycle Elite Member
 
Join Date: Feb 2014
Location: Maryland
Posts: 292
Default Re: What vintage fork will fit a 3-inch tire?

Thanks Rick, the members here are an endless source advice and inspiration. Nearly everything I've done has been done before (and probably better). Knowing a thing is possible before you start, always makes it easier.

I thought I'd mention, I considered threaded adjusters when fabricating my spring struts. It would not have been too difficult to add them. This would help immensely getting the pre-load right. I was trying to make a faithful copy though and decided against it. Your design might not have this restriction.
Reply With Quote
  #48  
Old 02-27-2017, 09:58 AM
indian22's Avatar
indian22 indian22 is offline
Motorized Bicycle Elite Member
 
Join Date: Dec 2014
Location: Oklahoma
Posts: 970
Default Re: What vintage fork will fit a 3-inch tire?

Wret I'm going to make a mental sticky about the addition of pre load adjustment to the leaf fork. I feel the idea holds merit & still look period correct. The more I view the early English & continental bikes the more I'm astounded by the variety of approaches presented by early fabricators to design functional sprung forks, so there may be examples of adjustable leaf forks being used. I would be surprised if they're not. Rick C.
Reply With Quote
Reply

Thread Tools
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 Off



All times are GMT -5. The time now is 12:18 AM.


Sponsors

Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
MotorBicycling.com