I'm glad someone asked this question as I have been wondering the same thing. One answer, posted so far, says to wear mountain bike shoes.

So what's better - road clips on a tri bike or SPD MTB clips? In the pictures of tri bikes threads, >90% of the pictures of tri bikes posted have road clips.

Here's the issue - and I don't mean to jump your thread abstract - but I'd rather own one pair of shoes -to MTB and tri in. Hence, one style (SPD MTB) of clip.

Does a road clip - like the ulegra pd-6620 which would require another shoe --give you more surface area for more power and efficency - or should I go with something like the Wellgo MG-8 that has a MTB cleat but is more oriented to road/tri.

Many thanks.