Collapsing Wheel Rims
- Thread starter 139NI
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PatrickPending
Legendary Member
- Location
- Leicester
theres some info here
http://ctc.org.uk/DesktopDefault.aspx?TabID=3827
i generally replace when the braking surface feels significantly concave some wheels even have wear indicators (a groove) built in.
hope this helps
http://ctc.org.uk/DesktopDefault.aspx?TabID=3827
i generally replace when the braking surface feels significantly concave some wheels even have wear indicators (a groove) built in.
hope this helps
marooncat
New Member
- Location
- West Lothian
Not really answering your question but back in the days when I knew nothing about bikes someone told me how I should blow my tires up much more than they were and proceeded to lend me a track pump to do this.. The rims then moved outwards so much due to be worn so thin the brakes stuck on. 
That someone took a good look at my bike (which was a cheap one to get me into cycling) and suggested that it was time to "retire" the bike and get a new one cause all of the bits that needed replaced would be more than the bike was worth!! (the replacement bike met it end this morning on the M8, a story told elsewhere on here)
That someone took a good look at my bike (which was a cheap one to get me into cycling) and suggested that it was time to "retire" the bike and get a new one cause all of the bits that needed replaced would be more than the bike was worth!! (the replacement bike met it end this morning on the M8, a story told elsewhere on here)
andrew_s
Legendary Member
- Location
- Gloucester
If you measure the thickness (eg jewellery tool), then rims seem to fail at about 0.6 to 0.7mm.
Most recent (last 5 years or so) rims have a wear indicator - either a groove that disappears as the surrounding material is worn away, or an internal cavity that shows up as a hole or slot. What the indicator is depends on the brand of rim.
As rims wear thin, tyre pressure will start to fold the flange outwards, so the apparent dish in the braking surface becomes pronounced.
Don't ignore any knocking or pulsing from the brakes. It could be the bulge where the rim has started to split going between the blocks. If this happens, let half the air out the tyre and ride directly home, slowly, without using the brake on that wheel.
Most recent (last 5 years or so) rims have a wear indicator - either a groove that disappears as the surrounding material is worn away, or an internal cavity that shows up as a hole or slot. What the indicator is depends on the brand of rim.
As rims wear thin, tyre pressure will start to fold the flange outwards, so the apparent dish in the braking surface becomes pronounced.
Don't ignore any knocking or pulsing from the brakes. It could be the bulge where the rim has started to split going between the blocks. If this happens, let half the air out the tyre and ride directly home, slowly, without using the brake on that wheel.
Globalti
Legendary Member
I've had rims blow out twice on MTBs, you get a very loud bang as the tube herniates out and explodes then you find that a long sliver of rim has curled off, usually breaking away at the point where the braking surface has been scored by a stone trapped in the brake pad.
Thanks to all so far.
My rims are single wall and dont have a groove machined into it to show wear.
are there tell tale signs of imminent rim explosion that anyone could notice whist out on a ride or by examining the rim at home which can overcome the shortcoming of not having wear indicators?
My rims are single wall and dont have a groove machined into it to show wear.
are there tell tale signs of imminent rim explosion that anyone could notice whist out on a ride or by examining the rim at home which can overcome the shortcoming of not having wear indicators?
