Helmet size.

[Milzy]

I’m a 56 head. The helmet I like is sold out in medium but the small is 52-56.
The medium is 54-58.
I should be ok with the small with a hat on right? Or would you go M & be in between instead of at the outer edge?

 

[I like Skol]

The answer is to try it on. Cycle helmets are not something for distance buying unless you are replacing an existing item like for like.

 

[CanucksTraveller]

I'm near the top end of my helmet's size range and it's snug, I can't get a hat on under the helmet.... my lid is Medium 54-60 and I'm a 58 head. I'd hang on for the next size up if wearing a hat is important. It can depend on the make to an extent too but middle of the size range is where I'd aim i think.
All this is based on buying a helmet make that I've already tried previously by the way, knowing what shape fits you is important.

 

[vickster]

you could try both, but I’d get the larger one and adjust especially if wearing something underneath (in my case that’s lots of hair )

 

[Drago]

Im with Skol - you need to try it on.

Leaving aside the sizing, you don't know if it will fit your head shape without trying. For example, my noggin is a fairly squarish shape and I simply cannot wear Giro lids, but relatively inexpensive Uvex bonce potties fit like a glove.

Sizing and fit are arguably more important that any other characteristic - go to a shop and try them on.

 

[Milzy]

The trouble is LBS have to order in. There’s a world cycling stock shortage. I don’t often bother with a cap. I may just take a risk, can always post it back.
I have a 10% code for the HexR helmets if anyone wants it. £299 & designed to your very own head through a phone app. You ware a special cap & take a sequence of pictures, send them on then they produce your lid & post.
Phil Lovett ended up advertising for them as they saw one of his vlogs on YouTube.
Even with the discount they’re still a bit too pricey & they seem to really suit Phil but look a bit naff on general random people.