Patrick,

My experience is the tire/rim size has a lot to do with the propensity
to pinch flat.  Before I became more bicycle educated I ran 19/20 mm
tires on various rim widths and pinch flatted on a regular basis (more
so on the wider rims).  Now I ride 28-37mm tires and don't recall the
last pinch flat.  The MA-2 rear rim on my Rambouillet (uses 28-30mm
tires) has a couple of small rim "dents" but I have not pinch flatted
on this bike.

I do not have experience carrying a significant rear load on tires the
size you are using.

Angus

On Jul 25, 6:26 pm, PATRICK MOORE <[email protected]> wrote:
> Sun M14A (semi aero, 19 mm outside width) 559 bsd rim -- very strong; I've
> used them offroad -- with very nice and cushy but too skinny old stock
> Specialized 26X1" Turbo (22 mm actual width on these rims), 130 mm OL
> spacing, no dish because it's a fixed wheel. (Riv content: 2003 Curt Custom,
> Dave Porter converted to fixed commuter.)
>
> I occasionally use it for grocery runs; this morning's load was 21 lb left
> Packer, 15 lb right Packer (stash included 7 bottles of cheap -- but, we
> hope, drinkable -- wine). Motive force is moi, at 170 lb.
>
> I hit all the expansion cracks (here in high desert ABQ we get six inchers;
> four is typical) and bumps carefully, butt off saddle.
>
> How much weight can such a wheel handle, regularly, somewhat careful rider
> -- never, ever, get pinch flats? Am I pushing the envelope of cosmic
> possibilities with 36 lb on my Fly?
>
> --
> Patrick Moore
> Albuquerque, NM
> Professional Resumes. Contact [email protected]
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