Which bike to ride for charity ride

I would ride a normal roadie for a charity ride. If you used it for training you might get a few looks, maybe a couple "it's not a race" comments, but not much else.

I don't remember too many tri bikes on last year's TDC.

Plenty of people ride TT bikes in charity rides.

If people care what you ride, they're there for the wrong reasons...ride what you want to.

Do the rules/guidelines for the ride have any restriction? I have seen it only once, but if the rules don't say you can't, go for it!

The normal rule applies - If you're going to ride in a group, stay out of aero if you're on your TT bike. Otherwise, there's no reason not to ride whichever bike you want to get miles on.

Have a good ride..

As long as there's not a rule saying you can't ride a TT bike I'd say go for it.

Its a charity ride.  I would think you could ride your kid's tricycle as long as you entered properly and made your donation (assuming there is nothing in the rules against it).

There's no reason not to if it is permitted and you want to.

Would I personally??  No.  But then again, I don't do charity rides.

189 miles over 2 days on my Felt S32 tri-bike this weekend.  Stayed out of aero unless I was pulling and it was smooth/flat road (and that was limited).  Most of Saturday I was either alone or with my training partner who also rode his tri-bike.  Sunday, we were the lead pack all day, and the group was 6-8 max, and cool with the aerobars when on the front.

Absolutely no issues.  I'd say that 10-20% of the bikes on the ride had aerobars (or century bars).