Tyre sizing

[Jono]

20x1&3/4 same as 20x1.75 are they the same

[Jono]

And if not does it matter will they both fit on same rim araya 7b to be exact

[Jaan]

NO!!

20 x 1 3/4 or S7s are skinny tyres developed for Schwinn they won't fit on a 7B

What year are your 7Bs Jono? Have you laced them yet as some have large spoke holes for heavy gauge spokes?

[Jaan]

http://bikecult.com/works/wheelsizes.html

[Jono]

1977 they are already laced although I am putting a coaster hub on the rear so will need to replace it hopefully spokes can be re used

[Jono]

So are they not 20" or are you saying they not wide enough for the rim I sppreciate 1 3/8 are skinned 1 3/4 should be considerably wider..... No

[Jono]

So are they not 20" or are you saying they not wide enough for the rim I sppreciate 1 3/8 are skinny Chris but 1 3/4 should be considerably wider..... No

[bobbbbsy]

1 will go on the other but not vice versa - i forget which. the answer is no .

[Jono]

Right so it's a radius thing 20 ain't really 20 then?

[bobbbbsy]

maybe u can - i think i tryed it the other way round .

http://bmxmuseum.com/forums/viewtopic.php?id=429549

maybe that means with rims ? oh im confused now. 

[Jaan]

Typically S7s are low profile tyres (these days) but with a wider bead so they're too big for 1.75 rims - 20 x 1 3/4 only fit Schwinn rims

[Jaan]

Porkchop sell 20 x 1 3/4 tyres and have this disclaimer:

* Size: 20" X 1 3/4" (IMPORTANT: These only fit Schwinn S-7 rims... they will NOT fit a 20" X 1.75". This is because a S-7 rim has a 419mm bead diameter and a "regular" 20" X 1.75" or 2.125" rim has a 406mm bead diameter. Although mathmatically the number looks the same, in the world of tire sizing, it is a COMPLETELY DIFFERENT SIZED TIRE. However, 20" X 1.75" TUBES are compatible with these tires.)

[Jaan]

maybe u can - i think i tryed it the other way round .

http://bmxmuseum.com/forums/viewtopic.php?id=429549

maybe that means with rims ? oh im confused now. 

That thread is about 1 3/8 tyres not 1 3/4 

[Jono]

Cheers boys just been reading Sheldon brown thingy n yep there's about 10 mm difference in rim so it's s no go cheers guys have to grovel to seller on eBay usa see if he'll csncel my bid lol

[bobbbbsy]

maybe u can - i think i tryed it the other way round .

http://bmxmuseum.com/forums/viewtopic.php?id=429549

maybe that means with rims ? oh im confused now. 

That thread is about 1 3/8 tyres not 1 3/4 

it was past midnight - not responsible.