It could become serious though. The doctor doing the scan said it was classic cyclist damage and that the best thing to do would be to reduce the amount of riding I do. I think it was a winter of turbo rides on an ill fitting fixed that was mainly to blame so I don't want to turn my back on what has always been part of my life.
Well I'm not medially inclined, but did he say it was about the vibrations in particular? I can not imagine the "baseline pressure" on the sitting area and adjacent parts to be much different between bikes, as different as they might be regarding their dampening characteristics. (Think riding on a perfectly smooth surface).
I know it's hard to cut back on an activity you like and have been gotten used to -- been there. But in the end sometimes the good old "better safe than sorry" applies, and there are alternatives that keep you fit without having to sweat indoors a lot over the off season. Hill running in particular.
All the best!