What road bike do you have?
09-11-11, 08:15 PM
Banned
Join Date: Oct 2007
Posts: 7,468
Bikes: 2011 Cervelo S2, 2001Trek USPS 5200, 06 Cervelo P3 Alum, 1999 Schwinn Pro Stock BMX, 1987 Schwinn Traveler
Likes: 0
Liked 0 Times
in
0 Posts
09-11-11, 08:37 PM
Banned
Join Date: Oct 2007
Posts: 7,468
Bikes: 2011 Cervelo S2, 2001Trek USPS 5200, 06 Cervelo P3 Alum, 1999 Schwinn Pro Stock BMX, 1987 Schwinn Traveler
Likes: 0
Liked 0 Times
in
0 Posts
that's a neat looking bike, and the female in the last pic has a nice set of legs on her.
09-11-11, 09:00 PM
Banned
Join Date: Oct 2007
Posts: 7,468
Bikes: 2011 Cervelo S2, 2001Trek USPS 5200, 06 Cervelo P3 Alum, 1999 Schwinn Pro Stock BMX, 1987 Schwinn Traveler
Likes: 0
Liked 0 Times
in
0 Posts
I've never seen a disc brake on the right side of the bike before either. Was that done to make the cable routing neater?
09-11-11, 09:09 PM
*
Join Date: Nov 2008
Location: Baltimore
Posts: 6,876
Bikes: https://velospace.org/node/18951
Likes: 0
Liked 1 Time
in
1 Post
it does make the routing neater, but i did it for a bit of security.
https://www.bikeradar.com/forum/viewt...f1dbf#16428986
Okay, so I am a new member and just found this thread by searching google, hence the 1 post. But, I think I have a useful input. I made some drawings to illustrate my point (which is in agreement with the assessment that front mounting the caliper is best for keeping the axle in the dropout.)
So, here we go with the rear mount disc. This is the setup.
Rear Mount Disc
Imagine the ground is moving beneath the wheel, as if it is on a treadmill. Now, in an instant, imagine we remove the nuts holding the axle on, so that it is NOT CONNECTED at all at the red dot. At the same time we APPLY the brakes so hard that we LOCK them up. This creates a pivot point around which the wheel will now rotate (rotate around the blue dot). In this setup, the wheel will pop out of the dropout, no question. The ground will pull the wheel underneath, popping it out.
Now, reset the whole situation, and instead of just removing the nuts on the axle, let's just barely tighten them on; then lock up the brakes. What happens? Well, the wheel pops out still.
Now, front disc mount.
Front Mount Disc
Do the same thing as above, remove the nuts, jam on the brakes..what happens? The axle will be forced in. Question answered.
Now why would the bike manufacturers put it on the back then??? Well, my guess is that they copied from a sector that was already using disc brakes - motorcycles. Motorcycles have them on the back and so that should work for bikes right? Well, first of all, motorcycles don't have dropouts, so there is no risk of pulling an axle out. Also, motorcycles probably just chose to put them in the back for aesthetics or in the case of off-road motorcycles, protection. So, there ya go, it was merely conventional (and still is), and the convention should change if they want to be sensible about it.
Of course, if you have a high enough clamping force then it doesn't matter either way, but the real concern is if something starts getting loose.
Okay, so I am a new member and just found this thread by searching google, hence the 1 post. But, I think I have a useful input. I made some drawings to illustrate my point (which is in agreement with the assessment that front mounting the caliper is best for keeping the axle in the dropout.)
So, here we go with the rear mount disc. This is the setup.
Rear Mount Disc
Imagine the ground is moving beneath the wheel, as if it is on a treadmill. Now, in an instant, imagine we remove the nuts holding the axle on, so that it is NOT CONNECTED at all at the red dot. At the same time we APPLY the brakes so hard that we LOCK them up. This creates a pivot point around which the wheel will now rotate (rotate around the blue dot). In this setup, the wheel will pop out of the dropout, no question. The ground will pull the wheel underneath, popping it out.
Now, reset the whole situation, and instead of just removing the nuts on the axle, let's just barely tighten them on; then lock up the brakes. What happens? Well, the wheel pops out still.
Now, front disc mount.
Front Mount Disc
Do the same thing as above, remove the nuts, jam on the brakes..what happens? The axle will be forced in. Question answered.
Now why would the bike manufacturers put it on the back then??? Well, my guess is that they copied from a sector that was already using disc brakes - motorcycles. Motorcycles have them on the back and so that should work for bikes right? Well, first of all, motorcycles don't have dropouts, so there is no risk of pulling an axle out. Also, motorcycles probably just chose to put them in the back for aesthetics or in the case of off-road motorcycles, protection. So, there ya go, it was merely conventional (and still is), and the convention should change if they want to be sensible about it.
Of course, if you have a high enough clamping force then it doesn't matter either way, but the real concern is if something starts getting loose.
__________________
α
α
09-11-11, 09:23 PM
Bike ≠ Car ≠ Ped.
I've seen very few bike brands that also put the disc caliper mount in front. Maybe just one other, in fact, and I can't even remember the name.
I would really like to have my next commuter built that way, though.
I would really like to have my next commuter built that way, though.
09-11-11, 09:26 PM
*
Join Date: Nov 2008
Location: Baltimore
Posts: 6,876
Bikes: https://velospace.org/node/18951
Likes: 0
Liked 1 Time
in
1 Post
haha, the stem cap is just a regular thomson with a steerer that needs a trim and a black spacer because i ran out of silver!
cotic makes a fork like that, and theyre the only folks i know of.
cotic makes a fork like that, and theyre the only folks i know of.
__________________
α
α
09-11-11, 09:39 PM
Bike ≠ Car ≠ Ped.
09-12-11, 07:16 AM
Senior Member
Join Date: Aug 2011
Location: Qc,Canada
Posts: 159
Bikes: Felt TK FRD
Liked 0 Times
in
0 Posts
09-12-11, 02:48 PM
Senior Member
Join Date: Aug 2011
Location: Qc,Canada
Posts: 159
Bikes: Felt TK FRD
Liked 0 Times
in
0 Posts
well i have no trouble locking up my rear with standard caliper brake, so to me the only reason to run rear disc brake is for mud clearance or wanting a symmetric braking systems. I would surely be fine with disc up front and a single pivot caliper brake.
09-12-11, 03:18 PM
*
Join Date: Nov 2008
Location: Baltimore
Posts: 6,876
Bikes: https://velospace.org/node/18951
Likes: 0
Liked 1 Time
in
1 Post
i went with the rear disc for inclement performance because dry rim power is plenty for me. if i had blue paved days in mind, even a front rim brake is plenty for sure.
__________________
α
α
09-12-11, 09:05 PM
Bike ≠ Car ≠ Ped.
And Bianchi made a FS road bike back in '94:
https://pezcyclingnews.com/?pg=fullstory&id=836
There are definitely days when I wish I had a Silk Road Cannondale...
https://pezcyclingnews.com/?pg=fullstory&id=836
There are definitely days when I wish I had a Silk Road Cannondale...
09-13-11, 06:04 AM
Flying Under the Radar
Join Date: Oct 2007
Location: Northeast PA
Posts: 4,116
Bikes: 10' SuperiorLite SL Club | 06' Giant FCR3 | 2010 GT Avalanche 3.0 Disc
Likes: 0
Liked 1 Time
in
1 Post
Good stuff. I'm assuming the availability for so many carbon parts at far less weight kinda of made those headshocks obsolete. Very cool looking though.
