Sizing of Herm Sprenger Novocontact and Dynamic RS bits?

[pattnic]

I’m looking at possibly trying a Novocontact, or Dynamic RS, but I’m not sure how the sizing runs on these. Intellectually, I know in what sizes each is available (in centimeters) and how that converts in inches, but I feel like I’ve heard or read that some (both?) of these bits run large. Am I making that up?

Horse in question is currently going in a WH loose ring that I had thought was 5.25" (13.5cm/135mm), but then realized it’s not actually made in that size, so it’s either a 13.0cm/130mm or 14.0cm/140mm (I think 14.0cm, as it measures 5.5" ring to ring - 5.25" if you subtract for the holes for the rings to run through). It just fits, so ideally the next bit would be slightly bigger.

Looking at a single-jointed loose ring in either case.

Thanks!

[flyracing]

I find when staying within the HS bits, they run true to their own sizing quite well. Maybe a horse here or there with a strange tongue may be able to disprove that, but for the most part I think of HS as being the standard for true sizing.

[GreyDes]

In my opinion, the Dynamic RS run slightly small. They measure true to size, but there’s something about the angle that meant my horses needed to go up a size. I had the same experience with the Neue Schuele bits - one size up worked perfectly.

I haven’t tried the Novocontact, so can’t comment on those.

[equiniphile]

I tried the single jointed Novocontact on my gelding (small, sensitive mouth) and he absolutely hated it. It was much thicker than I expected. However, the sizing appeared to run true to other Sprengers I’ve tried.