How do you know if your rims are worn out by braking?
- Thread starter Mitford
- Start date
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Mr Haematocrit
msg me on kik for android
- Location
- Out of the saddle
should have wear indicators on the rims. usually holes or a groove which can be raised
mark st1
Plastic Manc
- Location
- Leafy Berkshire
If you dont know go to your lbs or a competent bike mechanic and get them to check them for you dont find out the hard way like i did 
Iain M Norman
Well-Known Member
I ignored the markers once, soon knew about it when the seam popped a little and there was a 3mm wall for the brakes to hit.
accountantpete
OAP
A rough guide - put the edge of a ruler across the edge of the braking surface.
You should see light between the ruler and the rim.
If so get a page of a glossy mag and try and fit the corner of that page between the two.
The general rule is one page ok, two pages dodgy and three pages new wheel but it does depend on the rim.
You should see light between the ruler and the rim.
If so get a page of a glossy mag and try and fit the corner of that page between the two.
The general rule is one page ok, two pages dodgy and three pages new wheel but it does depend on the rim.
Titanium
Guru
- Location
- Penarth, South Wales.
Use your finger and thumb to feel both sides of the rim surfaces.
If it feels a bit concave, rather than flat, they're somewhat worn.
If the concave feel is quite 'deep' - time to replace the rims.
The above uses experience though; doing it for the first time you don't have any frame of reference. So pop by a couple of bike shops... I hope they won't just be interested in selling.
Accountantpete's advice is useful.
If it feels a bit concave, rather than flat, they're somewhat worn.
If the concave feel is quite 'deep' - time to replace the rims.
The above uses experience though; doing it for the first time you don't have any frame of reference. So pop by a couple of bike shops... I hope they won't just be interested in selling.
Accountantpete's advice is useful.
subaqua
What’s the point
- Location
- Leytonstone
e-rider
Banned member
- Location
- South West
they will go concave, and possibly start to show small cracks - if they are like this then they are very worn so stop using them!
fossyant
Ride It Like You Stole It!
- Location
- South Manchester
Mavic SUP rims don't have markers as it's a machined rim.
As others have said - if it starts to go concave, keep an eye out. Any cracks = replace NOW. They do go bang quite spectacularly when worn out !
As others have said - if it starts to go concave, keep an eye out. Any cracks = replace NOW. They do go bang quite spectacularly when worn out !
What if all the pages of your glossy mags are "stuck" together?????
andrew_s
Legendary Member
- Location
- Gloucester
Get yourself an Iwanson dental gauge and measure the rim wall thickness.
Rims seem to fail at about 0.7mm, so replace if you measure less than 1.0mm
Rims seem to fail at about 0.7mm, so replace if you measure less than 1.0mm
I measure 1.1 to 1.3mm with my lovely new dental gauge, so I feel reassured. Curious to know what the original thickness was though. Thanks again Andrew, the gauge was a great suggestion.
numbnuts
Legendary Member
- Location
- Gone over the hill and far away
I found the specifications of my rims which was 22.5 mm and now I just measure them with callipers
