LewTwo
1 MW
I found an old thread about an adapter plated use to mount v-brakes on a BMX bicycle that only had provisions for calipers brakes. Strangely enough it appears in the 'photos and videos'.
https://endless-sphere.com/forums/viewtopic.php?f=6&t=4725
I know this is an old thread but that adapter plate would be an excellent solution to two problems I have. Bike Wagon still have them listed on their site but they are 'Out of stock'. There seem to have been a number of similar adapters made but not anything currently available. It seems some DIY typee have made 'rolled their own' own. I thought that it should not be too difficult to use a jig saw to cut one out of 1/4 Aluminum plate. A stronger version could be cut from 1/4 steel plate with a water jet. The bad news is that no one appears to have published an information on the geometry. The only fact that I could locate was that the distance from the caliper bolt hole to the line through the brake bosses was adjustable from 108 to 117 mm. The good news is that regardless of the bike size they use the same V-brake or calipers parts. Therefor a device modeled for one size should fit others ... or at least be close enough to be made to work.
I have an old Tange 16 inch Tange MTB fork that I plan to use for a Bamboo bike project. I started by drawing up and adapter that duplicated the geometry from this fork.
To be fair I am guessing at the exact size and radius for the spring holes. They could easily be 3mm dia on 10mm centers. The rest should be fairly accurate. What I did NOT like about the Tange fork is that I could barely squeeze a 24x2.0 tire between the spring pads (and only because the manufacture made the tire 1/8 inch undersized). I wanted a tad more space between them. So I looked at various options to increase the size of the gap.
Option 1: maintain the vertical spacing and slide the bosses out.
Option 2: maintain the angle and slide the boss along it until it reaches the required horizontal spacing.
Option 3: maintain the radial dist and rotate the boss until it reaches the required horizontal spacing
Option 4: A combination of the above that 'splits the difference'
"Alex, I will take door number one please."
Then I created a new version using the selected geometry and cleaning up the dimensions.
The 65mm gap allows for a XX by 2.5 tire to clear the spring pads however one would only have 1/4 inch clearance across the diameter of the tire. In my case the point is mute because that is the inside width of my forks at that point. However for someone with more space I would suggest considering a the optional 75mm trim circle. Also note that the arms themselves should be secured in some manner to the fork blades or chain stay to resist rotation about the caliper mount hole. You could use hose clamps, tie wraps, duct tape or bailing wire .... but use something.
I am attaching a ZIP archive file with DXF and PDF files in case someone wants to modify this design to fit their own needs.
FYI there is at least one 'on-line' water jetting service: http://www.bigbluesaw.com/
EDIT: The springs are 2.5mm in diameter
14 Jan 2017:
For the record: Dan's Comp, 1 Competition Way, Mt. Vernon, IN 47620
Has a V-brake adapter plate very similar to the above.
Thank you to ES member 'dingoEsride' for pointing it out
.
"... to be used with 20x1.5" and 20x1.75" rims only ..."
I should not think the diameter of the wheel makes much difference ... only the rim cross section.
V-Brake https://www.danscomp.com/products/489051/V-Brake_Plate.html
https://endless-sphere.com/forums/viewtopic.php?f=6&t=4725
I know this is an old thread but that adapter plate would be an excellent solution to two problems I have. Bike Wagon still have them listed on their site but they are 'Out of stock'. There seem to have been a number of similar adapters made but not anything currently available. It seems some DIY typee have made 'rolled their own' own. I thought that it should not be too difficult to use a jig saw to cut one out of 1/4 Aluminum plate. A stronger version could be cut from 1/4 steel plate with a water jet. The bad news is that no one appears to have published an information on the geometry. The only fact that I could locate was that the distance from the caliper bolt hole to the line through the brake bosses was adjustable from 108 to 117 mm. The good news is that regardless of the bike size they use the same V-brake or calipers parts. Therefor a device modeled for one size should fit others ... or at least be close enough to be made to work.
I have an old Tange 16 inch Tange MTB fork that I plan to use for a Bamboo bike project. I started by drawing up and adapter that duplicated the geometry from this fork.
To be fair I am guessing at the exact size and radius for the spring holes. They could easily be 3mm dia on 10mm centers. The rest should be fairly accurate. What I did NOT like about the Tange fork is that I could barely squeeze a 24x2.0 tire between the spring pads (and only because the manufacture made the tire 1/8 inch undersized). I wanted a tad more space between them. So I looked at various options to increase the size of the gap.Option 1: maintain the vertical spacing and slide the bosses out. Option 2: maintain the angle and slide the boss along it until it reaches the required horizontal spacing.
Option 3: maintain the radial dist and rotate the boss until it reaches the required horizontal spacing
Option 4: A combination of the above that 'splits the difference'
"Alex, I will take door number one please."
Then I created a new version using the selected geometry and cleaning up the dimensions.
The 65mm gap allows for a XX by 2.5 tire to clear the spring pads however one would only have 1/4 inch clearance across the diameter of the tire. In my case the point is mute because that is the inside width of my forks at that point. However for someone with more space I would suggest considering a the optional 75mm trim circle. Also note that the arms themselves should be secured in some manner to the fork blades or chain stay to resist rotation about the caliper mount hole. You could use hose clamps, tie wraps, duct tape or bailing wire .... but use something.I am attaching a ZIP archive file with DXF and PDF files in case someone wants to modify this design to fit their own needs.
FYI there is at least one 'on-line' water jetting service: http://www.bigbluesaw.com/
EDIT: The springs are 2.5mm in diameter
14 Jan 2017:
For the record: Dan's Comp, 1 Competition Way, Mt. Vernon, IN 47620
Has a V-brake adapter plate very similar to the above.
Thank you to ES member 'dingoEsride' for pointing it out
.
"... to be used with 20x1.5" and 20x1.75" rims only ..."
I should not think the diameter of the wheel makes much difference ... only the rim cross section.
V-Brake https://www.danscomp.com/products/489051/V-Brake_Plate.html
