today I went to LBS to measure my sit bone width,the fitter use shimano sit bone tools to measure my sit bone width is 13cm.
I want to buy selleitlia ,ulr below
https://www.selleitalia.com/en/saddl...nio-superflow/
size s3 width is 130mm
size l3 width is 146mm
according to https://www.selleitalia.com/en/idmatch-experience/
idmatch,I go through 7 steps ,the result size is s3 but which only 130 width.
is it all right for me ? s3?
according to youtube or google I should choose my sit bone width plus 20mm which should be 150.
so how can I choose?
7 steps is below
1 male
2 height 179
3 body size medium
4 medium flexible
5 what kind of biker : road
6 which is your target : Medio fondo（sometimes I ride at night for 20km ,so I choose this one） Granfondo (sunday or sartaday I sometimes ride about 60-100km)Endurance(I don't understand this type) Cycle-Touring(I don't understand this type)
7 how long have you ride :I choose >6hours
the result size is s3 ,SP-01 BOOST KIT CARBONIO SUPERFLOW https://www.selleitalia.com/en/saddl...o-superflow-s/

so ,what the best choice for me?
I have called selleitalia about my question,the tech man told me should follow idmatch.......I also told him my sit bone width is 13cm.
my english is not good,can't fully understand he told me ,but his advice is s3 based on idmatch.



https://www.mantel.com/uk/selle-ital...perflow-saddle

seat bone width 115-129 s3 130-144 l3,so how can I choose?

General rule to start is “sit bones + 2cm” for width.

This, however, will vary by the shape of the saddle, and by your riding posture.

so if my sit bones is 13cm,if I choose s3 which width is 130mm ,is it ok?
or choose l3 which is 146mm
my posture is not very aggressive ,just normal.

If your sit bones are 13 cm. Add two you get 15cm. Convert that to mm and you'll get 150mm. So I'd go with that measurement for proper saddle width.

What did your bike fitter suggest?

+1 It's a special kind of backwards to have your sitbones measured by a bike fitter and then ask the internet what saddle you should buy.

I'd go 146 since your sit bones are at 130. And carbon rails are a luxury, not a necessity, so let your wallet steer you. Personally, I recently bought a Fabric Race saddle and really like it. About $100 USD w/Ti rails. Plenty light.

He just only told me that because he use shimano sit bone tools ,the measurement chart is only for shimano saddles,it maybe not suitable to other brand saddles.
He gave me to see the chart below ,the 13cm sit bone width should be choosen 142 or 152 based on shimano pro saddle,see pic below.I found the chart on internet same as the fitter told me
https://www.rideshimano.com/global/e...erfect-saddle/
also he told me it depend on the shape of the saddle..........

I have 13cm sit bones and I have a 145 Selle Italia Slr Superflow and it fits great. I used to ride a Power saddle with a 155. It depends on the saddle. You will be OK with a SelleItalia at 145.

thank you ~~~

I dont think I have sitbones. In any case, I'm a Unicanitor fan.

do you guys know what is difference of these?

Medio fondo
Granfondo
Endurance
Cycle-Touring
ring

No I'm sorry I don't. Hopefully one of the others will. I feel your pain, choosing the right saddle can be such a pain..... literally. I went through several and never found my goldilocks. I kinda gave up for a while. I've considered trying again this year but I have an old fizik that is working to I'm sticking with it for now. Good luck in the hunt. Sounds like a couple folks with some experience with your brand have offered some good advice.

Here's another manufacturers guidance for picking width.. ymmv;

I have done all the things that have been referenced here including computerized saddle mapping. Thee only thing that has ever worked over the past 40 yrs. is trial & error.

Agree on trial and error. I've been down the "scientific" road twice, both times pointing me to a seat that was pure hell. And yes, both times I used the "assometer" to get all the proper measurements. Epic fail, both times. I ended up with a Brooks C17, which I tried via another rider's suggestion. Never would have looked at it otherwise.

my english is not good,so Brooks C17 is good or bad to u?

The C17 is the saddle that works for me. It's a very different design from most modern saddles, though. Rubber base with a cotton lined top.

Medio fondo = not very long distance
Gran fondo = pretty long distance
Endurance = long distance
Cycle-touring = very long distance

so I sometimes ride in the city for about 15-20km at night,sometimes 40-120km at weekend.
so what type fits me ?

Hard to say. I haven't heard those terms used to refer to saddles before and I wouldn't necessarily use something like ride distance to choose a saddle, except that you want it to be comfortable on your longest rides. Your position on the bike is an important factor here. And as others have said, some trial and error is likely going to happen. If your shop has a saddle demo/test ride program, that might be good to try.