Wide-posts and V-brakes?
#1
Keepin it Wheel
Thread Starter
Join Date: Aug 2011
Location: San Diego
Posts: 10,244
Bikes: Surly CrossCheck, Krampus
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 26 Post(s)
Liked 3,417 Times
in
2,526 Posts
Wide-posts and V-brakes?
So the next problem with the rockhopper is trying to get some V-brakes on there. Turns out, the posts are spaced 9cm, vs the other bike I have with working V-brakes they're 8cm. So with the wide-spaced posts, the arms of the V-brakes have to be squeezed together extra far to get the pads to hit the rims, and there's no room for the boot. I wouldn't care about just tossing the boots, but it just seems wrong, and I bet I couldn't get the pads square, and couldn't get good braking leverage.
What kind of brakes came stock with a rockhopper like this? What brakes can I put on it that will work well?
NOTE this picture shows cantis, they are not stock, they were a first try, now I'm trying V-brakes
What kind of brakes came stock with a rockhopper like this? What brakes can I put on it that will work well?
NOTE this picture shows cantis, they are not stock, they were a first try, now I'm trying V-brakes
Last edited by RubeRad; 03-26-21 at 09:06 AM.
#2
Senior Member
Join Date: Feb 2015
Location: Mission Viejo
Posts: 5,801
Bikes: 1986 Cannondale SR400 (Flat bar commuter), 1988 Cannondale Criterium XTR, 1992 Serotta T-Max, 1995 Trek 970
Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 1943 Post(s)
Liked 2,164 Times
in
1,323 Posts
Cantilever brakes?
John
John
Likes For 2cam16:
Likes For cobba:
#5
Really Old Senior Member
Your brakes should have washers that you can relocate to move the pads closer to the rim.
I built a skinny "road" wheel for my hybrid and had a similar problem. You may need to find a couple extra washers out of the spare parts bin to add.
I built a skinny "road" wheel for my hybrid and had a similar problem. You may need to find a couple extra washers out of the spare parts bin to add.
Last edited by Bill Kapaun; 03-25-21 at 10:49 PM.
Likes For Bill Kapaun:
#6
Senior Member
Join Date: Feb 2004
Location: St Peters, Missouri
Posts: 30,225
Bikes: Catrike 559 I own some others but they don't get ridden very much.
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 1572 Post(s)
Liked 643 Times
in
364 Posts
What does your wheel collection look like? Find a wheelset with wider rims. Rhyno Lites, maybe?
That's the fun part about rebuilding old bikes. Everything on a bicycle works together so, when you change one part, you often find that you have to change something else to make it work.
That's the fun part about rebuilding old bikes. Everything on a bicycle works together so, when you change one part, you often find that you have to change something else to make it work.
__________________
My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.
My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.
Likes For Retro Grouch:
#7
Keepin it Wheel
Thread Starter
Join Date: Aug 2011
Location: San Diego
Posts: 10,244
Bikes: Surly CrossCheck, Krampus
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 26 Post(s)
Liked 3,417 Times
in
2,526 Posts
Sorry for the confusion, that pic is from a while back, it shows cantis, but those are out and I'm trying V-brakes
#8
Keepin it Wheel
Thread Starter
Join Date: Aug 2011
Location: San Diego
Posts: 10,244
Bikes: Surly CrossCheck, Krampus
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 26 Post(s)
Liked 3,417 Times
in
2,526 Posts
Do they sell extra-long-post replacement pads? (akin I guess to extra-long-reach caliper brakes for reaching 700C wheels from frames built for 27" wheels?)
#9
Keepin it Wheel
Thread Starter
Join Date: Aug 2011
Location: San Diego
Posts: 10,244
Bikes: Surly CrossCheck, Krampus
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 26 Post(s)
Liked 3,417 Times
in
2,526 Posts
What does your wheel collection look like? Find a wheelset with wider rims. Rhyno Lites, maybe?
That's the fun part about rebuilding old bikes. Everything on a bicycle works together so, when you change one part, you often find that you have to change something else to make it work.
That's the fun part about rebuilding old bikes. Everything on a bicycle works together so, when you change one part, you often find that you have to change something else to make it work.
#11
Keepin it Wheel
Thread Starter
Join Date: Aug 2011
Location: San Diego
Posts: 10,244
Bikes: Surly CrossCheck, Krampus
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 26 Post(s)
Liked 3,417 Times
in
2,526 Posts
I'm not sure, I think not, but I'm aware I'll need to deal with that, but first off I need to get the v-brake geometry right
#12
Keepin it Wheel
Thread Starter
Join Date: Aug 2011
Location: San Diego
Posts: 10,244
Bikes: Surly CrossCheck, Krampus
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 26 Post(s)
Liked 3,417 Times
in
2,526 Posts
Is there a standard spacing for v/canti brake posts? Does 9cm make v-brakes impossible?
#13
Really Old Senior Member
I'll give that a try, I took a brief look and it didn't seem obvious that the pads that are there could just be rearranged, or if I stuck 5mm of spacers in each side to make up the 1cm extra width, that the pads would still be able to be bolted on.
Do they sell extra-long-post replacement pads? (akin I guess to extra-long-reach caliper brakes for reaching 700C wheels from frames built for 27" wheels?)
Do they sell extra-long-post replacement pads? (akin I guess to extra-long-reach caliper brakes for reaching 700C wheels from frames built for 27" wheels?)
I don't have quite as much purchase on the threads as I'd like, but close.
#14
Senior Member
Join Date: Oct 2015
Location: San Diego, California
Posts: 4,077
Bikes: Velo Orange Piolet
Mentioned: 28 Post(s)
Tagged: 0 Thread(s)
Quoted: 2228 Post(s)
Liked 2,011 Times
in
972 Posts
Velocity Cliffhanger rims are 30mm wide outer (25mm inner). Get new rims and you won't need special brake pads.
#15
Keepin it Wheel
Thread Starter
Join Date: Aug 2011
Location: San Diego
Posts: 10,244
Bikes: Surly CrossCheck, Krampus
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 26 Post(s)
Liked 3,417 Times
in
2,526 Posts
yeah, I'm not going to be relacing wheels for this bike
#16
Senior Member
Join Date: Mar 2019
Posts: 1,606
Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Quoted: 581 Post(s)
Liked 921 Times
in
518 Posts
You generally don't need to change or add any washers to make V brakes work on differently spaced posts or rims - each V brake pad come with two convex washers and two concave washers, one thin and one thick. THe convex washers are always directly against the brake arm so they form a ball, and the thick/thin concave washers can be placed on the inside/outside or outside/inside, respectively, depending on your spacing requirements. There is also a flat washer on most sets and you can put this directly against the pad or under the nut, again depending on spacing requirements - against the pad will give you maximum extension for widely spaced posts.
#17
Senior Member
Join Date: Feb 2015
Location: Mission Viejo
Posts: 5,801
Bikes: 1986 Cannondale SR400 (Flat bar commuter), 1988 Cannondale Criterium XTR, 1992 Serotta T-Max, 1995 Trek 970
Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 1943 Post(s)
Liked 2,164 Times
in
1,323 Posts
You will never get it to work with cantilever brake levers. They will not move the brakes enough to make up the difference unless they are setup with about 1mm gap between the rim and brake pad.
It is the perfect storm wide posts and short pull levers. All you need now is a 7 speed cassette and 9 speed triggers to complete the project.
John
It is the perfect storm wide posts and short pull levers. All you need now is a 7 speed cassette and 9 speed triggers to complete the project.
John
Likes For 70sSanO:
#18
Keepin it Wheel
Thread Starter
Join Date: Aug 2011
Location: San Diego
Posts: 10,244
Bikes: Surly CrossCheck, Krampus
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 26 Post(s)
Liked 3,417 Times
in
2,526 Posts
well the 7-speed cassette is on there already
I just checked on ebay for 9-speed triggers, but found a great deal on 14-speed triggers, Imma get those and just click twice per gear
Before the brake levers even come into play though, I need to be able to manually/directly work the brake arms so that the pads contact the rims. Right now that happens with about 3cm of cable between the tops of the arms. Small enough to significantly compress the boot in the resting position, which I've never seen before.
I'll post a pic tonight if I can remember.
At least I headed off "those are cantis not v-brakes in the picture you dumbass" within only half a dozen posts
I just checked on ebay for 9-speed triggers, but found a great deal on 14-speed triggers, Imma get those and just click twice per gear
Before the brake levers even come into play though, I need to be able to manually/directly work the brake arms so that the pads contact the rims. Right now that happens with about 3cm of cable between the tops of the arms. Small enough to significantly compress the boot in the resting position, which I've never seen before.
I'll post a pic tonight if I can remember.
At least I headed off "those are cantis not v-brakes in the picture you dumbass" within only half a dozen posts
Last edited by RubeRad; 03-26-21 at 03:03 PM.
#19
Keepin it Wheel
Thread Starter
Join Date: Aug 2011
Location: San Diego
Posts: 10,244
Bikes: Surly CrossCheck, Krampus
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 26 Post(s)
Liked 3,417 Times
in
2,526 Posts
You generally don't need to change or add any washers to make V brakes work on differently spaced posts or rims - each V brake pad come with two convex washers and two concave washers, one thin and one thick. THe convex washers are always directly against the brake arm so they form a ball, and the thick/thin concave washers can be placed on the inside/outside or outside/inside, respectively, depending on your spacing requirements. There is also a flat washer on most sets and you can put this directly against the pad or under the nut, again depending on spacing requirements - against the pad will give you maximum extension for widely spaced posts.
#21
Keepin it Wheel
Thread Starter
Join Date: Aug 2011
Location: San Diego
Posts: 10,244
Bikes: Surly CrossCheck, Krampus
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 26 Post(s)
Liked 3,417 Times
in
2,526 Posts
patience, grasshopper
I'll post a pic tonight
I'll post a pic tonight
#22
Junior Member
My 97 Hardrock GX came with cantis, still have the bike, brakes are awesome.
#23
Keepin it Wheel
Thread Starter
Join Date: Aug 2011
Location: San Diego
Posts: 10,244
Bikes: Surly CrossCheck, Krampus
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 26 Post(s)
Liked 3,417 Times
in
2,526 Posts
I gotta work on the centering, but this is where the brake cable would need to be set to get the pads reasonably close to the rim.
In this astoundingly-focused picture, you can see my nipple. You can also probably tell that there is a sizable washer stack available for rearrangement. Probably that will do the trick.
In this astoundingly-focused picture, you can see my nipple. You can also probably tell that there is a sizable washer stack available for rearrangement. Probably that will do the trick.
#24
Keepin it Wheel
Thread Starter
Join Date: Aug 2011
Location: San Diego
Posts: 10,244
Bikes: Surly CrossCheck, Krampus
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 26 Post(s)
Liked 3,417 Times
in
2,526 Posts
Thx Bill Kapaun, I think you were first to what is probably the right answer, try rearranging washers.
Once again I'm guilty of not looking close enough / thinking hard enough before posting.
I can gare-on-frickin-tea it won't be the last time...
Once again I'm guilty of not looking close enough / thinking hard enough before posting.
I can gare-on-frickin-tea it won't be the last time...
#25
Senior Member