I recently picked up some very nice used Thule 599 Big Mouth racks for my car. I have a GF X-Cal as my main ride, and am running into some problems.

The front tire is a high volume tire, mounted to 38mm wide Kris Holm rims. I cannot get the front wheel clip to shut without dropping tire pressure down to ~15lbs. This is not so convenient as you can imagine.

Before anyone asks, I emailed Thule, and got two responses within 24hrs. Not bad customer service if you ask me...except each person responding told me a different part # .

Does anyone here have any personal experience with this, and how did you solve it?

Thanks in advance.