Did you roll over a sharp curb or cattle guard with low tire pressure?
That looks like it is done to me, certainly if it bulges back out when you air the tire up.

 

Nope, didn't run over anything and I aired up the tires before my ride. I was actually going very slow before a hill. I think this failure happened when I applied pressure to start going up hill. Nothing abnormal..very confused.

 

Should be posted in 'wheels/tires' for obvious reasons. Tire is ruined. Wheel is ruined. Looks like a rim brake wheel, I'm gonna go w/ the heat damage. Rim got hot, bead pushed out due to tire pressure, this cause the bead of the tire to push over the edge of the rim.

 

I didn't see the wheel/tire forum - admins please move if you'd like.

I don't think it was heat damage. I was moving slow and not braking at this time and was not braking for any extended period prior.

 

I can't see any other reason that would cause that, except maybe a BIG impact. It could be from a prior ride as well.

Do you prefer/use a lot of rear brake when descending?

 

Interesting...you'e lucky it was a rear wheel blowout. What pressure were you running & what weight are you? The rim is toast unfortunately.

 

Very lucky indeed! Pressure as around 100 and im around 175-180. Seem ok?

I can't see any other reason that would cause that, except maybe a BIG impact. It could be from a prior ride as well.

Do you prefer/use a lot of rear brake when descending?

Definitely a possibility but this bike has been used only on chicago lakefront trail which is quite smooth. It's Always possible I hit something and shrugged it off in the past.

Being in Chicago...it's super flat and rarely have significant descents. I usually try to distribute braking between front and rear brakes anyways.

Super bummed about the rim

I'll probably switch to alloy rim (at least in the rear). Any recommendations or helpful threads I should look at? I'd like something lightweight and somewhat affordable.

These seemed like a nice option. I wonder if they sell only rear wheels.
https://www.huntbikewheels.cc/colle...lections/road-wheels/products/aero-light-disc-road-wheelset-1449g-28deep-22wide

 

Damn plastic wheels.

Did you use tire irons to mount that tire, or pinch the tube between the tire and rim? I wouldn't use those tires if they were given to me. I used one on a bike mounted on a trainer and it developed a large bulge where cords ripped after less than 10 hrs. riding time.