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Offline Boris

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Replacing front discs
« on: 05 June, 2018, 07:46:56 PM »
Hi,

Is it really necessary to replace both front discs at the same time? One of mine is bent so definitely needs replacing but the other one is still well within the limit (measuring 4.3mm). Other than a good practice, is there any other justification to doing both?

Offline P Dubya

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Re: Replacing front discs
« Reply #1 on: 06 June, 2018, 04:45:26 PM »
I have the same problem.. The guys down at my local bike shop said no. But personally, I'm thinking about changing both. And the pads at the same time. Just for my own peace of mind.. Finances will have a big part in the matter though...
Enjoy The Ride!!!

Offline Boris

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Re: Replacing front discs
« Reply #2 on: 06 June, 2018, 05:02:18 PM »
I've managed to snatch a pair of good condition second hand discs from eBay for less than one brand new one.Sadly, there isn't much choice. I'll put a set of new pads as well and expect it to work well.
« Last Edit: 06 June, 2018, 05:27:42 PM by Boris »

Offline Boris

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Re: Replacing front discs
« Reply #3 on: 06 June, 2018, 05:26:08 PM »
Oh, and if it's the LH one you need, we can strike a deal (it measures 4.3mm with some light scoring)

Offline Shed

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Re: Replacing front discs
« Reply #4 on: 06 June, 2018, 11:44:55 PM »
*Originally Posted by Boris [+]
Hi,

Is it really necessary to replace both front discs at the same time? One of mine is bent so definitely needs replacing but the other one is still well within the limit (measuring 4.3mm). Other than a good practice, is there any other justification to doing both?


With the info you give here, there is no need to do both discs. (Pedants may argue otherwise).
Your remaining good disc at 4.3mm is barely worn at all. (New disc spec is 4.5mm).
Fit new, or good second-hand replacement disc.
Fit new pads to calipers on both sides.
Ride bike.

Only 'justification' for changing both discs is if you have one fancy wavy disc, and one normal round one, it's might look a bit odd!



« Last Edit: 07 June, 2018, 12:07:07 AM by Shed »

Offline Art

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Re: Replacing front discs
« Reply #5 on: 11 November, 2018, 03:31:11 PM »
YES it really is necessary.

The theory behind replacing both discs at the same time, same theory applies to replacing both sets of pads at the same time, is to maintain a balanced braking efficiency. If one side has too greater an efficiency over the other then front wheel oscillation and the resulting bad handling problems can occur.
« Last Edit: 11 November, 2018, 03:32:00 PM by Art »

Offline Shed

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Re: Replacing front discs
« Reply #6 on: 11 November, 2018, 07:02:46 PM »
*Originally Posted by Art [+]
YES it really is necessary.


No.
It really isn't necessary.

 


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