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Of bedding in and swapping wheets

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Of bedding in and swapping wheets

Old 08-18-15, 07:08 PM
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Alcanbrad
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Of bedding in and swapping wheets

The rear disc hub flange on our Spinnergy TX2 29'r failed (subject of future thread once I get through the warranty replacement thing) so I decided to invest in a second set of wheels to have options should we have wheel issues in the future. I am equipping the second wheel set with rotors so I don't have to move the rotors between hubs when I swap wheels.

I am new to disc brakes this season and still learning. I have read up a little on "bedding in" and it seems simple enough in concept and procedure.

So my questions are:

-I don't want to have to change pads whenever I swap wheels. So what do I risk by just swapping wheels whenever I feel like it and not swapping pads? Premature pad wear? Diminished or dangerous braking performance? Or nothing the write home about?

-Do I need to go through the bedding in process each time I swap wheels?

-I understand the need to clean contaminants/oils from the rotor before bedding in a new rotor. Is it really necessary to clean the rotor with brake cleaner when new, or can I use naptha (I already have naptha)

-

Last edited by Alcanbrad; 08-19-15 at 07:47 AM.
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Old 08-20-15, 06:31 AM
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Kicking this up because I'd also like to hear the answer, and didn't really see anything responsive online elsewhere.

In my experience you don't need to clean a new rotor.

As for bedding in a new rotor, it would seem to make sense that if the purpose of bedding in the pads, is in part to marry the pad to the rotor, that you'd want to bed in the system when you put a new wheel on with a new rotor.

However, when I've swapped wheels on my MTB I haven't noticed any problem with the brakes from the get go.

As a practical matter, It would seem a couple of hard stops repeated in a row when you put a new rotor on could not hurt anything.
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Old 08-20-15, 08:47 AM
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Some brand new disks do have a coat of oil/grease on them.

However, I have never had a problem just slapping them on.

I have always been a fan of organic brake pads.

Some current metallic pads actually coat the disk with some of their material on disk before they work properly. So for best performance need more bedding in.

I personally would not worry, I have put new rotors on my DH bike and just gone straight to ride. Test brakes before you ride and make sure they work good enough. they will bed in as you ride.

To reduce brake rub when changing wheels make sure the disks are at least same thickness, but same brand/model would be best.
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Old 08-23-15, 01:50 AM
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Originally Posted by Team Fab View Post
Some brand new disks do have a coat of oil/grease on them.

However, I have never had a problem just slapping them on.

I have always been a fan of organic brake pads.

Some current metallic pads actually coat the disk with some of their material on disk before they work properly. So for best performance need more bedding in.

I personally would not worry, I have put new rotors on my DH bike and just gone straight to ride. Test brakes before you ride and make sure they work good enough. they will bed in as you ride.

To reduce brake rub when changing wheels make sure the disks are at least same thickness, but same brand/model would be best.
I can burn up a set of organic pads on a tandem with only a few long descents. You put organic pads on a heavier teams bike, they might not make to the bottom of the hill before failing due to wear. Seen this happen.

The organic pads do seem to have a little more braking power, but prefer metal sintered pads to organic. I'm now running TRP Spire brakes on two different tandems and they have Shimano pads. It was a little unclear whether these were organic or metal sintered, however the seem to last long enough. I think the brand of pads can make a difference, but I'm always a little cautious about organic pads now.
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Old 08-25-15, 05:42 PM
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You might want to try the mechanics forum, it's not a tandem specific issue.
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Old 08-25-15, 07:32 PM
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Well, I split the difference, I cleaned the new rotors and performed a few braking maneuvers and the brakes worked fine. The first couple of times I applied the brakes, there was not much braking power but then it quickly came up to speed (hmm, not sure that is right? :-)).

I must say that I do like the braking performance of disc brakes on the tandem for normal braking, but I am not sure I am totally comfortable with steep descents. I think that braking on a descent was the cause of damage to my hub (again, a topic for a different thread once I get the warranty claim settled)
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Old 08-26-15, 09:05 AM
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As long as you stick with the same pad all is well. A scotch brite pad cleans them well as long as no grease is present.
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