Time to replace rim?

[gxaustin]

I had a failure of an Open Pro rim. On later examination the thickness of the brake track was a shade under 1mm, as measured with an Iwanson gauge.

[Mick F]

Done some measuring.

Tyre inflated to 100psi. Digi callipers measured on a few areas of the rim with the jaws pointing upwards from the hub, as the tyre is wider than the rim of course.
Inflated to 100psi and it comes out as 22.45mm as a sort of average.

Deflated the tyre and repeated.
Comes out as 22.32mm

ie, not much difference at all, though it is detectable.
0.1mm ish.



Are we considering a "normal" 700c diameter rim, or any diameter rim?
I'm measuring and considering a 406 (20") rim. Does that make a difference to this?

[Jay Gee]

Try pumping your tyre up to 100 psi and stand back

What fun! The rim failed around 120 psi and my ears were ringing from the pop!

[Brucey]

the thought of that happening whilst you are riding is enough to give you the willies....

cheers

[iandusud]

the thought of that happening whilst you are riding is enough to give you the willies....

cheers

I've witnessed it! Not my bike I hasted to add.

[iandusud]

Try pumping your tyre up to 100 psi and stand back

What fun! The rim failed around 120 psi and my ears were ringing from the pop!

rim pic.jpg

I hope you're paying attention at the back Mick F

[Mike Sales]

the thought of that happening whilst you are riding is enough to give you the willies....

cheers

I was accelerating down the hill from the traffic lights when there came a loud bang and I found myself lying in the road with my bike. As I lay there assessing the pains I noticed a sliver of aluminium next to my bike on the tarmac. Only bruises suffered. That is how I learned that rim wear could be a problem.

[Mick F]

Try pumping your tyre up to 100 psi and stand back

What fun! The rim failed around 120 psi and my ears were ringing from the pop!

rim pic.jpg

I hope you're paying attention at the back Mick F

Oh yes indeedy!

I'm keeping an eye on both front and rear on Moulton as I always use both brakes. The rear wears more due to the grit and muck off the roads .............. rear wheels are always dirtier than front wheels.

I bought a new pair of rims early last year, so if my riding gets more than it's been these last few months, the existing rims will need to be ditched. Believe me, I'm monitoring the situation.

[Jay Gee]

If I feel so inclined tomorrow, I'll take out the rear wheel, remove the tyre and tube, and measure again.

I found that I could push deflated tyre and inner tube to one side of the rim to measure the brake track thickness with an Iwanson gauge - no need to remove wheel or tyre.

That makes it a very quick job and something that I will definitely be doing on a regular basis from now on. Fun as my controlled explosion was in the garage, I would not want it to have happened on the road.

Very grateful to this forum for pointing me towards Iwanson gauges, at £3.25 with free postage from ebay there's no reason not to have one available.

[Mick F]

I found that I could push deflated tyre and inner tube to one side of the rim to measure the brake track thickness with an Iwanson gauge - no need to remove wheel or tyre.

That makes it a very quick job and something that I will definitely be doing on a regular basis from now on. Fun as my controlled explosion was in the garage, I would not want it to have happened on the road.

Very grateful to this forum for pointing me towards Iwanson gauges, at £3.25 with free postage from ebay there's no reason not to have one available.

Thanks.
Good info.

Bought my gauge from Toolzone in Plymouth. Similar price if my memory serves me correctly.
Rolson is the make. Cheap as chips.

[Mike Sales]

That is how I learned that rim wear could be a problem.

I still have Chris Juden's article from Cycletouring (and Campaigning) which describes how to bend a spoke so that with its aid and a vernier caliper you can measure wear accurately. The bent spoke is somewhere in my tool collection even now.

[531colin]

003 by 531colin, on Flickr

[Sweep]

Bought my gauge from Toolzone in Plymouth. Similar price if my memory serves me correctly.
Rolson is the make. Cheap as chips.

Do you have a link?

[Mick F]

Bought my gauge from Toolzone in Plymouth. Similar price if my memory serves me correctly.
Rolson is the make. Cheap as chips.

Do you have a link?

This is mine.
https://www.rolsontools.com/product/diamond-gauge/
There's no way on God's Earth that I paid that!

£3ish from Toolzone in Plymouth. They don't list it now though.

[Sweep]

Bought my gauge from Toolzone in Plymouth. Similar price if my memory serves me correctly.
Rolson is the make. Cheap as chips.

Do you have a link?

This is mine.
https://www.rolsontools.com/product/diamond-gauge/
There's no way on God's Earth that I paid that!

£3ish from Toolzone in Plymouth. They don't list it now though.

thanks for looking Mick - explains why I couldn't find it.