Retrobike Forum Index

It is currently Wed Dec 07, 2016 10:06 am

* Login   * Register * Search  * FAQ



Post new topic Reply to topic  [ 81 posts ]  Go to page 1, 2, 3, 4, 5 ... 9  Next
Author Message
PostPosted: Fri Sep 18, 2009 3:38 am 
Retro Guru
User avatar

Joined: Thu Sep 11, 2008 4:36 pm
Posts: 1586
Location: West Sussex.
Frame is an old Kona Cindercone 1997.

Im actually considering something DIY as Im quite handy with metalwork. I was thinking of something that makes use of the pannier boss on the dropout and clamps the seatstay about 2/3"inches up. Nice and simple and compact.

I know about the A2Z and brake therapy adapters. Are there any other options?

I would like to run Hope mono minis.


Last edited by mikesnowdon on Wed Sep 30, 2009 7:36 pm, edited 2 times in total.

Top
 Profile  
 
 Post subject:
PostPosted: Fri Sep 18, 2009 8:07 am 
Retro Guru
User avatar

Joined: Tue Aug 05, 2008 11:23 am
Posts: 807
Location: West Sussex
BETD do some adaptors although nothing specific for Kona. Usually have to drill a couple of small holes in the dropout. Only really works for alu frames. Not been much help have I? Have a look, you might be able to modify something.
I do know of someone using an A2Z adaptor on a King Kahuna though.


Top
 Profile  
 
PostPosted: Fri Sep 18, 2009 8:13 am 
Retro Guru
User avatar

Joined: Tue Aug 07, 2007 12:22 pm
Posts: 2942
Location: Platsa, Messinias, Greece
mikesnowdon wrote:
Frame is an old Kona Cindercone 1997.

Im actually considering something DIY as Im quite handy with metalwork.
I would like to run Hope mono minis.


In that case I'd suggest doing what I've done with my '95 Explosif and that you make up a proper braze on caliper mount.
It's probably an easier job than trying to fabricate some sort of bolt-on arrangement.

You need to make up a fixture to locate the inner face of the bracket in line with the inner face of the dropout and the two caliper mounting holes (at 51mm crs.) at the correct distance from the wheel spindle centre.
Some 10mm threaded bar, some M10 nuts and a piece of 6mm thk. steel plus a few washers is all you need - just make sure that it all ends up at 90 degrees to the wheel spidle axis.

Here are the IS standard dimensions.

And a photo of one that I made earlier....

A couple of bits of advice - although the inner face of the mount is theoretically in line with the inside of the dropout, it's best to position the mount outboard by maybe .1mm/.004" (space it out during brazing with a couple of caliper shims) and make the final adjustment with shims, because if you have the mount too far inboard then the only adjustment you have is by facing material off the mount.
Likewise, it does no harm to have the spindle centre to hole crs. dimensions 0.5mm/.020" over those specified, as otherwise some calipers (Magura Marta for example) run extremely close to the disc periphary.

Silver solder the whole lot in place with 842 alloy (610-620 deg. C)
You can get the silver solder and flux from these people.
The seatstay/chainstay brace is just a piece of tube cut from an old frame.
You'll need to birdbeak the ends so that they fit really snugly - the same with the caliper bracket, it all should fit as well as possible before silver soldering.

If you need any more info just shout, but after this Saturday I will be away from (this) home for seven weeks (with no internet access), so I'll be incommunicado..... :)
I'll have to ride bikes instead 8)


Attachments:
Caliper-mount.jpg
Caliper-mount.jpg [ 104.98 KiB | Viewed 5485 times ]
Top
 Profile  
 
 Post subject:
PostPosted: Fri Sep 18, 2009 8:37 am 
Old School Grand Master
User avatar

Joined: Mon Jun 25, 2007 8:37 am
Posts: 3146
Location: Whiskey bent & hellbound!
That is nice work :D


Top
 Profile  
 
 Post subject:
PostPosted: Fri Sep 18, 2009 10:25 am 
Posh Mark
Posh Mark
User avatar

Joined: Wed Apr 18, 2007 2:49 pm
Posts: 5982
Location: As far from the city as you can be ....
Argos handy work......

Looks better than factory:

Image

Image

Have also used an AtoZ and can say they work but just aren't as pretty!

Image


Last edited by letmetalktomark on Fri Sep 18, 2009 10:56 am, edited 1 time in total.

Top
 Profile  
 
PostPosted: Fri Sep 18, 2009 10:27 am 
Posh Mark
Posh Mark
User avatar

Joined: Wed Apr 18, 2007 2:49 pm
Posts: 5982
Location: As far from the city as you can be ....
Andy R wrote:

And a photo of one that I made earlier....



Dang thats good work :shock: 8)

I do like that bike Andy 8) 8)


Top
 Profile  
 
PostPosted: Fri Sep 18, 2009 10:43 am 
Retro Guru
User avatar

Joined: Tue Aug 07, 2007 12:22 pm
Posts: 2942
Location: Platsa, Messinias, Greece
letmetalktomark wrote:
Andy R wrote:

And a photo of one that I made earlier....



Dang thats good work :shock: 8)

I do like that bike Andy 8) 8)


Yes, I seem to remember you saying so before :D - I'm (as I'm sure everyone is aware :oops: ) ridiculously fond of it and it's difficult for me to imagine anything that would suit me better 8) .
I'll really miss it while I'm in Greece for the next seven weeks :cry:


Top
 Profile  
 
 Post subject:
PostPosted: Fri Sep 18, 2009 10:49 am 
retrobike rider / Gold Trader
retrobike rider / Gold Trader

Joined: Sat Jul 21, 2007 9:48 am
Posts: 6978
Location: Bristle
old konas are really prone to snapping at the dropout....

therefore, i wouldnt.


Top
 Profile  
 
 Post subject:
PostPosted: Fri Sep 18, 2009 10:53 am 
Posh Mark
Posh Mark
User avatar

Joined: Wed Apr 18, 2007 2:49 pm
Posts: 5982
Location: As far from the city as you can be ....
cce wrote:
old konas are really prone to snapping at the dropout....

therefore, i wouldnt.


Not if modded correctly :wink:

Argos checked the weld area before starting - does mean loosing more paint but well worth it.

Also if you stick to rotor sizes of no more than 160mm you should be fine.

Image


Top
 Profile  
 
PostPosted: Fri Sep 18, 2009 10:55 am 
Posh Mark
Posh Mark
User avatar

Joined: Wed Apr 18, 2007 2:49 pm
Posts: 5982
Location: As far from the city as you can be ....
Andy R wrote:
I'll really miss it while I'm in Greece for the next seven weeks :cry:


The tribulations one must put up with whilst somewhere warm :lol: :lol: :lol:

How is the big front wheel thing working out?


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 81 posts ]  Go to page 1, 2, 3, 4, 5 ... 9  Next

All times are UTC [ DST ]


Who is online

Users browsing this forum: Google [Bot], Retro Spud and 21 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

About Us

Follow Retrobike

Other cool stuff

All content © 2005-2015 Retrobike unless otherwise stated.
Cookies Policy.
bikedeals - the best bike deals in one place
FatCOGS - Fat Chance Owner's Group

Powered by phpBB® Forum Software © phpBB Group