Disc discoloration on brand new bike
#51
Klaatu..Verata..Necktie?
Join Date: May 2007
Location: SF Bay Area
Posts: 17,993
Bikes: Litespeed Ultimate, Ultegra; Canyon Endurace, 105; Battaglin MAX, Chorus; Bianchi 928 Veloce; Ritchey Road Logic, Dura Ace; Cannondale R500 RX100; Schwinn Circuit, Sante; Lotus Supreme, Dura Ace
Mentioned: 41 Post(s)
Tagged: 0 Thread(s)
Quoted: 10445 Post(s)
Liked 11,930 Times
in
6,105 Posts
Only my front rotor shows signs of bluing, which is not surprising since I use the front brake more and with much more force, since I generally don't want to lock up the rear wheel and skid.
__________________
"Don't take life so serious-it ain't nohow permanent."
"Everybody's gotta be somewhere." - Eccles
"Don't take life so serious-it ain't nohow permanent."
"Everybody's gotta be somewhere." - Eccles
Likes For genejockey:
#52
Senior Member
Join Date: Apr 2019
Location: UK
Posts: 1,404
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 682 Post(s)
Liked 453 Times
in
338 Posts
Not sure what you think is unlikely about the discolouration (from iron oxide forming on the surface at about 300°C) ) being only visible near the braking track and removed from it by the brake pads, given everything that you and others have said.
#53
Senior Member
Thread Starter
Join Date: Mar 2021
Posts: 1,995
Mentioned: 24 Post(s)
Tagged: 0 Thread(s)
Quoted: 2700 Post(s)
Liked 486 Times
in
351 Posts
Im surprised that there is any discoloration (I guess the consensus is that it is an oxide?) Im surprised that any formed, and since it is not uniform on the braking surface and because I haven't done very much with the front brake yet, I dont like to believe that it was everywhere. The bike is less than 20 miles old.
That being said, it does make sense that it is happening all over the braking surface and just being rubbed away. My gut tells me this isn't the case, but I do not know. If others say that its likely that the discoloration is likely happening elsewhere on the rotor and just being rubbed off by the brakes, I would listen.
That being said, it does make sense that it is happening all over the braking surface and just being rubbed away. My gut tells me this isn't the case, but I do not know. If others say that its likely that the discoloration is likely happening elsewhere on the rotor and just being rubbed off by the brakes, I would listen.
#54
Senior Member
Join Date: Apr 2019
Location: UK
Posts: 1,404
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 682 Post(s)
Liked 453 Times
in
338 Posts
Im surprised that there is any discoloration (I guess the consensus is that it is an oxide?) Im surprised that any formed, and since it is not uniform on the braking surface and because I haven't done very much with the front brake yet, I dont like to believe that it was everywhere. The bike is less than 20 miles old.
That being said, it does make sense that it is happening all over the braking surface and just being rubbed away. My gut tells me this isn't the case, but I do not know. If others say that its likely that the discoloration is likely happening elsewhere on the rotor and just being rubbed off by the brakes, I would listen.
That being said, it does make sense that it is happening all over the braking surface and just being rubbed away. My gut tells me this isn't the case, but I do not know. If others say that its likely that the discoloration is likely happening elsewhere on the rotor and just being rubbed off by the brakes, I would listen.
https://steelfabservices.com.au/temp...20temperatures.
You only have to heat it once to create it.
It isn’t on the braking surface at all, because the pads have removed it.
#55
Klaatu..Verata..Necktie?
Join Date: May 2007
Location: SF Bay Area
Posts: 17,993
Bikes: Litespeed Ultimate, Ultegra; Canyon Endurace, 105; Battaglin MAX, Chorus; Bianchi 928 Veloce; Ritchey Road Logic, Dura Ace; Cannondale R500 RX100; Schwinn Circuit, Sante; Lotus Supreme, Dura Ace
Mentioned: 41 Post(s)
Tagged: 0 Thread(s)
Quoted: 10445 Post(s)
Liked 11,930 Times
in
6,105 Posts
Im surprised that there is any discoloration (I guess the consensus is that it is an oxide?) Im surprised that any formed, and since it is not uniform on the braking surface and because I haven't done very much with the front brake yet, I dont like to believe that it was everywhere. The bike is less than 20 miles old.
That being said, it does make sense that it is happening all over the braking surface and just being rubbed away. My gut tells me this isn't the case, but I do not know. If others say that its likely that the discoloration is likely happening elsewhere on the rotor and just being rubbed off by the brakes, I would listen.
That being said, it does make sense that it is happening all over the braking surface and just being rubbed away. My gut tells me this isn't the case, but I do not know. If others say that its likely that the discoloration is likely happening elsewhere on the rotor and just being rubbed off by the brakes, I would listen.
You supposedly work at SLAC, with Scientists, and yet without being able to offer an alternative hypothesis, or even a plausible explanation for why this WOULDN'T be the case, you day your GUT tells you it isn't the case?
Don't listen to guts. They're full of ****.
__________________
"Don't take life so serious-it ain't nohow permanent."
"Everybody's gotta be somewhere." - Eccles
"Don't take life so serious-it ain't nohow permanent."
"Everybody's gotta be somewhere." - Eccles
Likes For genejockey:
#56
Senior Member
Thread Starter
Join Date: Mar 2021
Posts: 1,995
Mentioned: 24 Post(s)
Tagged: 0 Thread(s)
Quoted: 2700 Post(s)
Liked 486 Times
in
351 Posts
*sigh*
You supposedly work at SLAC, with Scientists, and yet without being able to offer an alternative hypothesis, or even a plausible explanation for why this WOULDN'T be the case, you day your GUT tells you it isn't the case?
Don't listen to guts. They're full of ****.
You supposedly work at SLAC, with Scientists, and yet without being able to offer an alternative hypothesis, or even a plausible explanation for why this WOULDN'T be the case, you day your GUT tells you it isn't the case?
Don't listen to guts. They're full of ****.
#57
Senior Member
Join Date: Apr 2019
Location: UK
Posts: 1,404
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 682 Post(s)
Liked 453 Times
in
338 Posts
Look down the rotor edge as you pull the brakes. You can see where the pads make contact.
Last edited by choddo; 11-06-23 at 01:57 AM.
Likes For choddo:
#58
Senior Member
Join Date: May 2021
Posts: 8,472
Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
Quoted: 4429 Post(s)
Liked 4,880 Times
in
3,021 Posts
Im surprised that there is any discoloration (I guess the consensus is that it is an oxide?) Im surprised that any formed, and since it is not uniform on the braking surface and because I haven't done very much with the front brake yet, I dont like to believe that it was everywhere. The bike is less than 20 miles old.
That being said, it does make sense that it is happening all over the braking surface and just being rubbed away. My gut tells me this isn't the case, but I do not know. If others say that its likely that the discoloration is likely happening elsewhere on the rotor and just being rubbed off by the brakes, I would listen.
That being said, it does make sense that it is happening all over the braking surface and just being rubbed away. My gut tells me this isn't the case, but I do not know. If others say that its likely that the discoloration is likely happening elsewhere on the rotor and just being rubbed off by the brakes, I would listen.
#59
Senior Member
Join Date: Sep 2007
Location: Far beyond the pale horizon.
Posts: 14,278
Mentioned: 31 Post(s)
Tagged: 0 Thread(s)
Quoted: 4260 Post(s)
Liked 1,366 Times
in
947 Posts
*sigh*
You supposedly work at SLAC, with Scientists, and yet without being able to offer an alternative hypothesis, or even a plausible explanation for why this WOULDN'T be the case, you day your GUT tells you it isn't the case?
Don't listen to guts. They're full of ****.
You supposedly work at SLAC, with Scientists, and yet without being able to offer an alternative hypothesis, or even a plausible explanation for why this WOULDN'T be the case, you day your GUT tells you it isn't the case?
Don't listen to guts. They're full of ****.
He doesn’t know (since he’s asking the question) but no one else can be right.
Likes For njkayaker:
#60
Senior Member
Join Date: Dec 2019
Location: 757
Posts: 11,255
Bikes: Madone, Emonda, 5500, Ritchey Breakaway
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 10238 Post(s)
Liked 5,189 Times
in
2,226 Posts
As I read this thread I started to think about my many rotors. I don’t think I have ever looked at them.
Likes For jadmt:
#62
Expired Member
Join Date: Jun 2007
Location: TN
Posts: 11,568
Mentioned: 41 Post(s)
Tagged: 0 Thread(s)
Quoted: 3683 Post(s)
Liked 5,452 Times
in
2,771 Posts
I agree. A light application of grease will reduce friction and the resulting noise and heat. As with rational thought, education and social skills, some find braking overrated.
Likes For shelbyfv:
#63
-------
Join Date: Jul 2020
Location: Tejas
Posts: 12,797
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 9656 Post(s)
Liked 6,366 Times
in
3,506 Posts
Looks like oil slick finish to me. Live with it - it's cool.
Likes For Mojo31:
#64
Senior Member
Join Date: Sep 2017
Posts: 7,898
Mentioned: 38 Post(s)
Tagged: 0 Thread(s)
Quoted: 6976 Post(s)
Liked 10,975 Times
in
4,695 Posts
Likes For Koyote:
#65
Senior Member
Join Date: Dec 2019
Location: 757
Posts: 11,255
Bikes: Madone, Emonda, 5500, Ritchey Breakaway
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 10238 Post(s)
Liked 5,189 Times
in
2,226 Posts
#66
Senior Member
Join Date: Jan 2010
Posts: 39,271
Mentioned: 211 Post(s)
Tagged: 1 Thread(s)
Quoted: 18432 Post(s)
Liked 15,587 Times
in
7,341 Posts
The last bike I bought get 13 miles on it just from riding home from the builder's shop. They day after I bought my IF, I rode it 85 miles.
In any event, you did that to your rotors after only 15 miles and, like, two days? I smell something.
In any event, you did that to your rotors after only 15 miles and, like, two days? I smell something.
#67
Senior Member
Join Date: Jan 2010
Posts: 39,271
Mentioned: 211 Post(s)
Tagged: 1 Thread(s)
Quoted: 18432 Post(s)
Liked 15,587 Times
in
7,341 Posts
#68
-------
Join Date: Jul 2020
Location: Tejas
Posts: 12,797
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 9656 Post(s)
Liked 6,366 Times
in
3,506 Posts
#69
Senior Member
Join Date: Jul 2006
Location: Jacksonville, FL
Posts: 6,888
Bikes: Trek Domane SLR 7 AXS, Trek CheckPoint SL7 AXS, Trek Emonda ALR AXS, Trek FX 5 Sport
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 769 Post(s)
Liked 1,750 Times
in
1,018 Posts
Yea it was sort of half hearted response as I knew it would be ignored, but I said my bit.
#70
Senior Member
Join Date: Dec 2019
Location: 757
Posts: 11,255
Bikes: Madone, Emonda, 5500, Ritchey Breakaway
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 10238 Post(s)
Liked 5,189 Times
in
2,226 Posts
Likes For eduskator:
#72
Senior Member
Join Date: Dec 2019
Location: 757
Posts: 11,255
Bikes: Madone, Emonda, 5500, Ritchey Breakaway
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 10238 Post(s)
Liked 5,189 Times
in
2,226 Posts
Likes For bampilot06:
#73
Senior Member
Join Date: Jul 2009
Posts: 5,956
Bikes: Colnago, Van Dessel, Factor, Cervelo, Ritchey
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 3958 Post(s)
Liked 7,313 Times
in
2,951 Posts
#74
Senior Member
Thread Starter
Join Date: Mar 2021
Posts: 1,995
Mentioned: 24 Post(s)
Tagged: 0 Thread(s)
Quoted: 2700 Post(s)
Liked 486 Times
in
351 Posts
It’s a brand new bike from a bike shop, and it was ridden like 20 miles or something when that pic was taken. How unusual is this? Is it indicative of misalignment, and I shouldn’t be riding it in case it messes things up further?
of course I’m going to bring it back to the shop, it’s a matter of time though, they’ll have to fix my old bike so I have something to commute on. Can’t afford to leave this bike at the shop overnight. This is what it looks like now, maybe 10 miles since the last pic? Also, are fingerprints and grease from hands bad for rotors, like should I wear gloves if touching? I just touched it by mistake
of course I’m going to bring it back to the shop, it’s a matter of time though, they’ll have to fix my old bike so I have something to commute on. Can’t afford to leave this bike at the shop overnight. This is what it looks like now, maybe 10 miles since the last pic? Also, are fingerprints and grease from hands bad for rotors, like should I wear gloves if touching? I just touched it by mistake
Last edited by LarrySellerz; 11-06-23 at 05:09 PM.
#75
Senior Member
Join Date: Sep 2007
Location: Far beyond the pale horizon.
Posts: 14,278
Mentioned: 31 Post(s)
Tagged: 0 Thread(s)
Quoted: 4260 Post(s)
Liked 1,366 Times
in
947 Posts
How far is the shop from where you live? Most shops will look at it right then. (There probably is nothing to fix.) When did you notice the color change?
Last edited by njkayaker; 11-06-23 at 06:03 PM.