Does anyone wear a motocross helmet on their ST? I already wear glasses and hate looking through the shield on my full face helmet. I love wearing my 3/4 helmet and adjusting the windscreen just below my field of vision for freeway speeds. There is that concern about less protection. Could a motocross helmet be the best of both worlds?
As with anything that has to do with motorcycles, there's always pro's and con's. I've considered a dirtbirt style helmet for summertime use due to the extra windflow. A set of vented goggles and I'd be good. (I wear glasses also) The downside, as has been mentioned, is that the visor is one heck of a wind brake. I almost lost a passenger once who, while wearing a motocross, popped her head out a bit to see around me. The wind caught the visor and snapped her head backwards. I felt something was wrong and slowed down immediately. Scared the crap outta her. Definitely something to keep in mind. You could probably just remove the visor or customize some extra vents. Check out the
Arai XD3 It's designed as street and dirt.
You mentioned not liking looking through the shield on your helmet. Out of curiosity, what kind of helmet is it and how old is the helmet? The optics on older helmets (even 5 years ago) wasn't so spectacular and your vision was distorted slightly. The optics on the newer ones are greatly improved however, some of the newer "less expensive" helmets' optics aren't so great.
Whether you use a dirtbike, full face, 3/4, half, or one of those non-DOT beanie helmets, it all comes down to what you feel comfortable with after honestly considering all the pro's and con's.(Personal Risk Acceptance) If you feel good with a dirtbike helmet, I say "go for it!". It's your decision to make.
The only caution I will throw out there is watching out for your eyes. A standard set of glasses are not adequate protection while riding. Wind, dirt, and debris can come around the sides of them and leave you blinded. (Hopefully just temporary) Obviously, the ability to see is pretty critical for motorcycle riding. Look into the wrap-around style glasses for better protection. They make motorcycle designed ones that include a foam liner around the edges to help keep stuff out. If you are required to wear prescription glasses, you can get the wrap-arounds in a prescription. Regardless of the helmet debate, proper eye protection is one thing I don't joke around about. While crashing is a "might happen/might not happen" thing, the constant barrage of dust, dirt, bugs, rocks, small car parts is pretty consistent. A bug bite or cut lip will heal, but an eye injury may never.
Hope this helps.