Canti posts and offset?
11-08-11, 04:55 PM
#1
Member
Thread Starter
Join Date: Jul 2011
Location: Porter Square
Posts: 35
Bikes: Somec Promax, Philips 3-Speed, Spec. Crux
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Canti posts and offset?
I'm about to fix up an old Bob Jackson, this is my first experience brazing canti posts.
Nova has a bunch of different offsets for canti's what should I be looking for to determine offset?
Nova has a bunch of different offsets for canti's what should I be looking for to determine offset?
11-08-11, 05:35 PM
#2
Banned
what brakes do you want to run?. newer decedents of the Mafac ones..
Empella Froglegs, EuroX copies and such,
have no pad height adjustments, so Where you place the bosses
determines the brake adjustment.
My older forks have a narrow boss spacing,
but the modern cross forks have a wider spacing. [narrower than the rear]
and so the brakes are made to suit the cross/MTB spacing ..
I'd buy the brakes , fit the wheels, and let them tell you what the spacing,
and location, should be..
That's what I did 35 years ago with the Mafac ones..
AlAn cross frames had the bosses on the center line of the fork blade,
no off set, [but they got adhesive bonded not brazed]
Empella Froglegs, EuroX copies and such,
have no pad height adjustments, so Where you place the bosses
determines the brake adjustment.
My older forks have a narrow boss spacing,
but the modern cross forks have a wider spacing. [narrower than the rear]
and so the brakes are made to suit the cross/MTB spacing ..
I'd buy the brakes , fit the wheels, and let them tell you what the spacing,
and location, should be..
That's what I did 35 years ago with the Mafac ones..
AlAn cross frames had the bosses on the center line of the fork blade,
no off set, [but they got adhesive bonded not brazed]
Last edited by fietsbob; 11-08-11 at 05:40 PM.
11-08-11, 06:05 PM
#3
Senior Member
Join Date: Sep 2009
Location: EagleRiver AK
Posts: 1,305
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 28 Post(s)
Likes: 0
Liked 60 Times
in
33 Posts
Ive put canti post on several steel CX bikes and have used Nova's 7mm single mitre post for brazing to the front fork and thier 9mm double-mitre post for attaching to standard size/configuration rear seatstays. These resulted in around 75mm spacing and worked fine with my brakes, required very little additional prep work on the lugs for a tight mitre fit at the intended location. You could of course also get thier zero offset post and mitre them yourself (or alter the mitres as needed from either of the 7 or 9mm offset). Canti post are so cheap (way below minimim order surcharge and shipping cost) so it is probably a good idea to get an extra set to have onhand should you find that you need something slightly different.
Most all canti brake arms have some means to adjust the pads in/out to compensate for pad wear so exact width of the post placement on the frame is not critical.
Good thread on canti post spacing over here;
https://forums.mtbr.com/vintage-retro...st-399297.html
Most all canti brake arms have some means to adjust the pads in/out to compensate for pad wear so exact width of the post placement on the frame is not critical.
Good thread on canti post spacing over here;
https://forums.mtbr.com/vintage-retro...st-399297.html
Last edited by GrayJay; 11-11-11 at 03:17 PM.
11-08-11, 07:55 PM
#4
Randomhead
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 24,383
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 3,684 Times
in
2,508 Posts
modern cantis are 80mm apart. Take a ruler, measure 80mm, and see where you are relative to the stays. That should help you decide which bosses to buy
Thread
Thread Starter
Forum
Replies
Last Post
DIMcyclist
Bicycle Mechanics
6
11-26-13 10:38 PM
Barrettscv
Cyclocross and Gravelbiking (Recreational)
9
10-04-13 10:02 AM
Barrettscv
Classic & Vintage
4
10-04-13 09:53 AM
