IMO just bail.. you need both knees and training/racing on it injured could do more permanent damage. I have learned all of this the hard way. I do want to say that I hope you got more of a diagnoses than a "tweaked" knee... what is that? Is it tendon? Ligament? did you have an MRI? or Xray? I would call back and ask for more of an answer...

[quote=rpcv_adriana]The big race, though, is Rev3 at Cedar Point in September, 140.6 distance. ... Stay signed up for the race and attempt it being under prepared? Switch to the half and hope that goes well? Bail entirely? [/quote]

Irrespective of the continuing damage and the inferior training/racing results, 140.6 "under prepared" makes for a horrible race day. It goes on and on, a never-ending death march. Tri is supposed to be fun. It's not your job. You can fake a sprint and Oly. Have a bad day in what should be a one- or two-hour race and it adds maybe a half hour. Big deal. You could have a bad day at a half and add an hour and change. But a 140.6 with sub-par training and conditioning means that you spend 99% of the bike leg "listening" to your knee, hoping not to feel a tweak, with paranoid reactions to even the slightest twinge. Then you start the run, only to realize about 100m in, "This ain't gonna work." So now what? Limp 40k? That's a long walk. Think six hours plus. I turned in a run leg longer than my bike time at an Ironman and OMG I loathed every step after about 5hrs. The boredom and the solitude were killing me more than any injury. I don't know Rev3's withdrawal policies, but if they're anything like WTC, I'd say you keep your spot right up until the last minute. If you don't think you could turn in an 75% effort on the bike (ie, actually race the first 80-90 or so) and a 50% effort on the run (ie, run 13.1 of it), then bail on it. At least pick up your shwag. Sherpa for your friends. You owe them that, at least. Live to race another day.

+1 Sooner.

No way would I toe the line if I had doubts about my knee being able to hold up. Take time off, rest it, rehab it, do whatever you have to do to heal. But if you're not "mostly" ready on the race day because of an injury in April, you're going to eff yourself big-time by trying to make it through 140.6. No need to ruin what should be one of the best days of your life.

Your post says:
"June 17"
"haven't been able to run more than two miles without it becoming bothersome"
"I can bike 25 miles "
"The big race, ... in September, 140.6"

You're done. Do you really think you're going from 25 miles to 112 on the bike, and 2 to 26.2 on the run, in three months, on a bum wheel?

I did IMTX really undertrainined due to a shattered collarbone, but I was at least able to get SOME run training in and some stationary bike work. You're dealing with a knee.

As Sooner says, if you can get $$$ back, great. If not, hold on until the end and got sherpa if you have to. You can't fake 140.6, and it's usually best to respect the distance.