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Shoe size calculator - Page 3

post #31 of 42
Glad I could help. Drop me an e-mail if you need anything else. I always enjoy talking to someone who is interested in shoes and also able to talk geek. wink.gif
Quote:
Originally Posted by niklasnordin View Post

Given the coefficients and my numbers, I can now play around with my numbers and see how it affects the size.

Increasing/decreasing each value by ...lets say 5 mm, which I think is a reasonable measurement error, I can get a feel for if Im close to a 6 or 7.

Hopefully, you don't mean to play with your measurements. This is like scientist "playing" with the data to get the result he wants.

To give you an impression, how measurement errors reflect any estimate:

I also tried using Least Squares in a "disjunctive" approach (repeated two-dimensional) which seem more in line with what my sources tell me about grading. They say, for every last length increment in mm, there's an corresponding increment in all the other dimensions in mm.

So, I constructed a "reference last" that would be perfect for an average foot shape of Sizeadvisors' members. Since an increment of half a unit in UK sizes is an increment of 4.235 mm in last length, my current estimates for the grading procedure are thus:
Code:
Foot length:    4.235 mm * 1          = 4.235       mm
Ball girth:     4.235 mm * 0.54524508 = 2.309112914 mm
Ball width:     4.235 mm * 0.25838468 = 1.094259120 mm
Heel width:     4.235 mm * 0.18921089 = 0.801308119 mm
Instep girth:   4.235 mm * 0.58475284 = 2.476428277 mm
Heel Girth:     4.235 mm * 0.99456132 = 4.211967190 mm

Put differently, mis-measure your ball width by a mere Millimeter, and your shoe size estimate for the "reference last" might be off half a unit if we would only consider this unit.
Quote:
The 6.5 in the 348 has always felt a bit too large for me if Im going to be honest, but I think its necessary due to my high instep.

To be honest, your current measurements don't reflect a high instep.

Your instep is probably best indicated by the (short) heel girth measure. When I compare your values to the expected average for someone with your foot length, yours lie 8.359mm below the expected value. This translates to almost a full size on Sizeadviors' internal "reference last".

In other words, if we'd only consider heel girth, you should be wearing a UK 5 on Sizeadvisors reference last.

Although this is not the same as C&J's 348 last in E, I still found the information useful. First, I expect every last to behave like this. Second, the average last probably reflects the average of all available lasts to some degree.
post #32 of 42
Thread Starter 

This is really interesting.

Here's a pic of me wearing a 348 Edgware size uk6.5,

http://instagram.com/p/MgTZIXNn2s/
 

if you look at the gap at the shoe-laces this, to me, suggests that the shoe is slightly too small.

But, if you look at the creasing at the toe, this, to me again, is an indication of that my shoe is slightly too large, especially the right shoe,

which has a very unfortunate way of creasing, that I think stems from not breaking them in properly.

If I remember correctly these were the 2nd pair of C&J I bought and the first on the 348 last and I just put them on and started to use them.

Since then I've read that you should not do this :)

 

 

> Hopefully, you don't mean to play with your measurements. This is like scientist "playing" with the data to get the result he wants.

That is what I meant, but not to 'get what I want'.

As you say, its quite sensitive to how you measure and my assumption was just that given any data set, the error is bound to be at least a few

millimeters. So my idea was to use the 'fit-function', to get a recommendation for different sizes.

Some people are perhaps smack dead center in the 6.5 size, which would require the data you enter to be less accurate.

Others might be 6.5, but very close to a 7,so the smallest error in their measurements would give 'wrong size'.

However, this might not necessary be a bad thing since they could use both (all depending on personal preference)

 

If I give you a scenario...

I enter my data and out comes something like this.

Your size is: X. depending on the accuraty of the data you have supplied there are indications that you could also be a size Y.

 

Now my collegue wants me to get back to work, so I have to pick this up laters :)

 

thanks for the updates. I'd be interested to see how this develops

post #33 of 42
I believe, I've seen worse for the 348 last.

To me, the creasing at the toe suggests that the toe spread (Hm, hopefully, this is the correct translation) is too low relative to the toe allowance. This can happen if one buys shoes too large (ie. too long). But it can also happen if the last is elogated, and the last designer didn't raise the toe spread accordingly.

As far as I know, deeper creasing seems rather common for the 348. After all, it's an elogated last. A shoes tip is presssed upwards, anyway, when one walks. But the forces are a bit stronger for elogated lasts unless the toe spread is higher, too.

Additionally, if your right foot is a tad shorter than your left, different creasing patterns seem to be rather common.

The gap at the shoe-laces indeed suggests that your instep is high relative to the last and size. But without knowing how the last behaves in relation to the average, it's hard to make a judgement.

Also, let's not forget that Sizeadvisors sample might be biased. Or maybe, I made a mistakes somewhere in the calculations.
post #34 of 42

So Claus,

 

My heel girth is 365 mm (for US length 11.5).  Would that indicate a low, medium, or high instep?

 

Thanks

post #35 of 42
Quote:
Originally Posted by Lustro View Post

My heel girth is 365 mm (for US length 11.5). Would that indicate a low, medium, or high instep?

I'd need your foot length(s), measured while standing upright (preferably in Millimeters).

The info "US 11.5" is too ambiguous: It can mean "this is what I wear usually" which is often false when one has a low or high instep; it can mean: "this is what I was measured" and then there's the problem of the various differences between measurement devises.
post #36 of 42

Oops, double post....


Edited by Lustro - 3/18/13 at 8:43am
post #37 of 42

So here is my data
 
toes: 24 cm
instep 26 cm
length: 26 cm

 

Wow, just did this. I have almost identical measurements to OP.

Toes: 23.5cm

Instep: 26cm

Length: 26.2cm

 

Any idea what size you are in Vass and Carmina Simpson Last?  

post #38 of 42
Thread Starter 
Quote:
Originally Posted by dg626 View Post

 

Wow, just did this. I have almost identical measurements to OP.

Toes: 23.5cm

Instep: 26cm

Length: 26.2cm

 

Any idea what size you are in Vass and Carmina Simpson Last?  

sadly no, I've been drooling over the Vass thread for a while, bit I dont dare to order a pair.

I havent tried the Simpson last, but on the Rain I'm using 7.

post #39 of 42
Thread Starter 
Quote:
Originally Posted by Claus View Post


I'd need your foot length(s), measured while standing upright (preferably in Millimeters).

The info "US 11.5" is too ambiguous: It can mean "this is what I wear usually" which is often false when one has a low or high instep; it can mean: "this is what I was measured" and then there's the problem of the various differences between measurement devises.

so true.

There is a guy on your site with very similar measurements to mine that thinks size 8 on the 348 last for C & J is a good fit, albeit with a pair of thick socks...

Still, I am using size 6.5 and Im thinking maybe to switch to a 6. If I would use a size 8 I could add a pair of oars and row across the ocean to the UK :)

post #40 of 42
Quote:
Originally Posted by niklasnordin View Post

sadly no, I've been drooling over the Vass thread for a while, bit I dont dare to order a pair.

I havent tried the Simpson last, but on the Rain I'm using 7.

 

Same here in regards to the Vass Thread. I have decided on the Vass Shoes I want, and will probably place my order tomorrow. Bit of gamble in regards to size as I have no way of trying them, but hopefully I will get it right, and will report back in a few weeks when I get them. 

 

In regards to Carmina, thanks for posting your size. So looks like Size 7 should work for me in Rain, so I'm guessing maybe size 7 or 7.5 in Simpson last as I've read it's narrower than Rain. 

post #41 of 42
Thread Starter 
Quote:
Originally Posted by dg626 View Post

 

Same here in regards to the Vass Thread. I have decided on the Vass Shoes I want, and will probably place my order tomorrow. Bit of gamble in regards to size as I have no way of trying them, but hopefully I will get it right, and will report back in a few weeks when I get them. 

 

In regards to Carmina, thanks for posting your size. So looks like Size 7 should work for me in Rain, so I'm guessing maybe size 7 or 7.5 in Simpson last as I've read it's narrower than Rain. 

Cool :)

Be sure to post the pics and also let me know how they fit. Which Vass size will you go for?

 

Yes, its narrower although the Rain is quite wide, I'd guess a 7 or 7.5 for the Simpson as well. I'd venture for the 7 though. The 7 for me is definitely not on the small side.

 

With all the online shopping that is starting to pop up and the difficulties in getting the size right I've sort of changed my mind in how to calculate your vendor/last size.

Now I'm thinking that it would be pretty cool if the shoe vendors sold last mockups.

Basically it would just be a plastic shoe, or wrap, that you could order for a cheap sum, maybe around 10-30 euro, and they'd send you a size X on last Y.

This sounds like a nice business idea to me :)

post #42 of 42

OK Claus,

 

My heel girth is 365 mm, like I said above, and my foot length is 285 mm.  Would that indicate a low, medium, or high instep?

 

Thanks!

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