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Offline BMX1973

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measuring Wheel Rims - PLEASE HELP
« on: June 28, 2011, 03:30 PM »
How can you tell the width of a rim, where is the measurement taken from?

 :daumenhoch:
« Last Edit: June 29, 2011, 11:50 AM by BMX1973 »

Offline TELLIS302000

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Re: measuring Wheel Rims
« Reply #1 on: June 28, 2011, 03:53 PM »

How can you tell the width of a rim, where is the measurement taken from?

 :daumenhoch:
The 2 faces that your brake pads run on.

A

SaMAlex

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Re: measuring Wheel Rims
« Reply #2 on: June 28, 2011, 04:00 PM »
Read what is says on the tire!  :LolLolLolLol:

Offline TELLIS302000

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Re: measuring Wheel Rims
« Reply #3 on: June 28, 2011, 04:21 PM »
Read what is says on the tire!  :LolLolLolLol:
He said width......

Reading the tyre does'nt give you the width of the rim.  ;D

Offline BMX1973

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Re: measuring Wheel Rims
« Reply #4 on: June 28, 2011, 05:56 PM »
I'm a bit confused  :-[
I've got two rims one has 1.5 on it and the second is definately wider but no size on it, so I guess this is 1.75.
However both the faces that the brake pads rub on are both just over half inch.  :-\
But I still cant work out where to take the measurment from :-\
 :D



[/quote]The 2 faces that your brake pads run on.

A
[/quote]
« Last Edit: June 28, 2011, 10:46 PM by BMX1973 »

Offline BMX1973

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Re: measuring Wheel Rims - PLEASE HELP
« Reply #5 on: June 29, 2011, 11:50 AM »
please help :(

SaMAlex

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Re: measuring Wheel Rims - PLEASE HELP
« Reply #6 on: June 29, 2011, 12:13 PM »
If someone can answer, can they also say why 20 x 1.75 rims are a smaller diameter to 20 x 1 3/8 rims?

When they came up with the names of wheel sizes they were just making it up as they went along!!!

Offline BMX1973

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Re: measuring Wheel Rims - PLEASE HELP
« Reply #7 on: June 29, 2011, 12:23 PM »
Ah, someone knows where I'm coming from ;)


If someone can answer, can they also say why 20 x 1.75 rims are a smaller diameter to 20 x 1 3/8 rims?

When they came up with the names of wheel sizes they were just making it up as they went along!!!

Offline Gnarlyscoots

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Re: measuring Wheel Rims - PLEASE HELP
« Reply #8 on: June 29, 2011, 12:32 PM »
I think you will find that the sizes stamped into the rims are the recommended tyre size for that rim.

You may have a wide rim but it may also only be single walled for lightness thus enabling lighter riders to use 1 3/8 tyres. You could have the same size rim but double walled enabling the rider to be heavier but also having slightly wider tyres like 1.75.

 :daumenhoch:  :daumenhoch:
« Last Edit: June 29, 2011, 12:35 PM by Londonhellboy »
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SaMAlex

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Re: measuring Wheel Rims - PLEASE HELP
« Reply #9 on: June 29, 2011, 12:39 PM »
You may have a wide rim but it may also only be single walled for lightness thus enabling lighter riders to use 1 3/8 tyres. You could have the same size rim but double walled enabling the rider to be heavier but also having slightly wider tyres like 1.75.


Na dude. (20 x 1 3/8) & (20 x 1 1/8) are a TOTALLY different wheel size to (20 x 1.75) & (20 x 1.5). "Skinnies" are much bigger diameter. You have to have a shorter reach brake and everything.

Offline Gnarlyscoots

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Re: measuring Wheel Rims - PLEASE HELP
« Reply #10 on: June 29, 2011, 01:05 PM »
True on the TYRE sizes but you wouldn't put a 20 X 1.75 tyre on race rim would you ???

Most of the first gen Peregrine rims were unstamped and the early Ukai's and Arayas only had Ukai and Araya stamped on the rim. The tyre sizes back in the day were really only 1.75.

As for the race rims, they also did not have sizes stamped on the rim, just the name.

If you look at a guide to tyres fitted to rims, it states what size tyre should be used in what weight catergory.

Check out this wheel/tyre/age/weight guide http://localbmxco.com/articles/buyers-guide-to-bmx-bikes-pg58.htm

Hope this helps

Tj
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SaMAlex

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Re: measuring Wheel Rims - PLEASE HELP
« Reply #11 on: June 29, 2011, 01:09 PM »
True on the TYRE sizes but you wouldn't put a 20 X 1.75 tyre on race rim would you ???


You lost me now. Isn't a comp3 a race tire? What rim are you meant to put a 1.75 Comp3 on, if not a race rim?

You wouldnt put a 20 x 1.75 tire on a "Skinny" (1 1/8 or 1 3/8) rim cos it just wont fit, The rim's dia is way to big
« Last Edit: June 29, 2011, 01:10 PM by S&MAlex »

Offline Gnarlyscoots

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Re: measuring Wheel Rims - PLEASE HELP
« Reply #12 on: June 29, 2011, 01:36 PM »
True on the TYRE sizes but you wouldn't put a 20 X 1.75 tyre on race rim would you ???


You lost me now. Isn't a comp3 a race tire? What rim are you meant to put a 1.75 Comp3 on, if not a race rim?

You wouldnt put a 20 x 1.75 tire on a "Skinny" (1 1/8 or 1 3/8) rim cos it just wont fit, The rim's dia is way to big
When racing first started, wheel size was 20 inch. You fitted 1.75 tyres on the rear, 2.125 on the front for grip on the corners. As it progressed, wheels got bigger i.e 22 inch and thinner for 'lighter' riders, KIDS etc etc......Tyres had to do the same, obviously. 1.75 tyres are for the 'heavier' racers and 1 1/8 are for 'lighter' racers. You wouldn't see my 14 stone body hacking it round a track with 1 1/8 rims and tyres would you ?? NO......They are for the lighter rider, KIDS.

As for the diameter, or RADIUS, you cannot fit  a 20 X 1.75 tyre to a 21 or 22 inch rim can you ?? NO.... but you can fit a 20 X 1.75 tyre to a 20 inch 'skinny' rim. Likewise, you can fit a 20 X 1 1/8 tyre to standard size Ukai but it don't look right, the rim would ground on the corners and 'heavier' rider would rip it to shreds

Understand now ???
« Last Edit: June 29, 2011, 01:39 PM by Londonhellboy »
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SaMAlex

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Re: measuring Wheel Rims - PLEASE HELP
« Reply #13 on: June 29, 2011, 01:51 PM »
Understand now ???


No, and TBH, i stopped caring soon after my own reply  :LolLolLolLol:

JT71

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Re: measuring Wheel Rims - PLEASE HELP
« Reply #14 on: June 29, 2011, 02:15 PM »
Is 20" roughly, give or take a fraction (not Faction) of an inch, not just the overall diameter of the complete wheel/tyre assembly?
clearly skinny rims for kids racing bike have a larger diameter (just the rim) than my big fokk off fat chrome Ody rims.
Therefore, the skinny racing tyres, with lower profile side walls, and a larger diameter hole, ie, between the beading won't fit on a wider bmx rim, not because of the rim width but because of the diameter?

The actual rims have different diameters but are all still 20" wheels.

22" wheels, as seen on Factions bikes, and so i'm told on some bikes from Toy R Us (though I can't confirm this, I thought Toy R Us only sold Lego, Action Figures and Top Trumps) don't have 22" diameter rims...the whole wheel/tyre assembly is 22"....give or take.

as the 2nd bestest front brake rider on Rad says, the skinny rims have a larger diameter.





JT71

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Re: measuring Wheel Rims - PLEASE HELP
« Reply #15 on: June 29, 2011, 02:25 PM »
where's Ratty?

I'm certain he'd know for sure.


Offline TELLIS302000

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Re: measuring Wheel Rims - PLEASE HELP
« Reply #16 on: June 29, 2011, 02:32 PM »
How can you tell the width of a rim, where is the measurement taken from?

 :daumenhoch:
1st question^^^^^

answer = take off the tyre, now hold a tape measure from 1 side of the rim side to the other........measurement = rim width!


JT71

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Re: measuring Wheel Rims - PLEASE HELP
« Reply #17 on: June 29, 2011, 02:47 PM »
How can you tell the width of a rim, where is the measurement taken from?

 :daumenhoch:
1st question^^^^^

answer = take off the tyre, now hold a tape measure from 1 side of the rim side to the other........measurement = rim width!



fact!

but no where near as interesting as the rest of it! lol.

SaMAlex

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Re: measuring Wheel Rims - PLEASE HELP
« Reply #18 on: June 29, 2011, 09:27 PM »
Most 20 x 1.75 rims "measure" about 1.25" from brake surface to brake surface.  20 x 1.5 rims measure .... a bit less

The size of a bike rim (and tire) is more like a "name" rather than a measurement. The diameter and the width, are just reference names.


(Did you know that on normal bikes, a (26 x 1 3/8) wheel/tire is a different diameter to a (26 x 1 1/4)? Yeah .... stupid, aint it!)

Offline BMX1973

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Re: measuring Wheel Rims - PLEASE HELP
« Reply #19 on: June 30, 2011, 06:08 PM »
thanks S&MAlex that answears it.


Most 20 x 1.75 rims "measure" about 1.25" from brake surface to brake surface.  20 x 1.5 rims measure .... a bit less

The size of a bike rim (and tire) is more like a "name" rather than a measurement. The diameter and the width, are just reference names.


(Did you know that on normal bikes, a (26 x 1 3/8) wheel/tire is a different diameter to a (26 x 1 1/4)? Yeah .... stupid, aint it!)

Offline stidds

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Re: measuring Wheel Rims - PLEASE HELP
« Reply #20 on: June 30, 2011, 06:23 PM »

When racing first started, wheel size was 20 inch. You fitted 1.75 tyres on the rear, 2.125 on the front for grip on the corners. As it progressed, wheels got bigger i.e 22 inch and thinner for 'lighter' riders, KIDS etc etc......Tyres had to do the same, obviously. 1.75 tyres are for the 'heavier' racers and 1 1/8 are for 'lighter' racers. You wouldn't see my 14 stone body hacking it round a track with 1 1/8 rims and tyres would you ?? NO......They are for the lighter rider, KIDS.

As for the diameter, or RADIUS, you cannot fit  a 20 X 1.75 tyre to a 21 or 22 inch rim can you ?? NO.... but you can fit a 20 X 1.75 tyre to a 20 inch 'skinny' rim. Likewise, you can fit a 20 X 1 1/8 tyre to standard size Ukai but it don't look right, the rim would ground on the corners and 'heavier' rider would rip it to shreds

Understand now ???

Actually 'skinny' rims are 17 3/4" (451mm ERD)  in diameter, whereas 'normal' bmx rims are 16" (406mm ERD) in diameter, I cannot remember why they are different I think it is to do with one being measured 'fractional' (1.5, 1.75 etc) and one 'dicimel' (1 1/8, 1 3/8).

Oh good God am I really that sad  ;D :'(
« Last Edit: June 30, 2011, 08:07 PM by Stidds »

Offline Betty

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Re: measuring Wheel Rims - PLEASE HELP
« Reply #21 on: June 30, 2011, 06:54 PM »
Bet the poor bloke is wishing he'd never asked...  ;D
2 minutes turkish...

Offline Dark Diggler

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Re: measuring Wheel Rims - PLEASE HELP
« Reply #22 on: June 30, 2011, 07:12 PM »
True on the TYRE sizes but you wouldn't put a 20 X 1.75 tyre on race rim would you ???


You lost me now. Isn't a comp3 a race tire? What rim are you meant to put a 1.75 Comp3 on, if not a race rim?

You wouldnt put a 20 x 1.75 tire on a "Skinny" (1 1/8 or 1 3/8) rim cos it just wont fit, The rim's dia is way to big
When racing first started, wheel size was 20 inch. You fitted 1.75 tyres on the rear, 2.125 on the front for grip on the corners. As it progressed, wheels got bigger i.e 22 inch and thinner for 'lighter' riders, KIDS etc etc......Tyres had to do the same, obviously. 1.75 tyres are for the 'heavier' racers and 1 1/8 are for 'lighter' racers. You wouldn't see my 14 stone body hacking it round a track with 1 1/8 rims and tyres would you ?? NO......They are for the lighter rider, KIDS.

As for the diameter, or RADIUS, you cannot fit  a 20 X 1.75 tyre to a 21 or 22 inch rim can you ?? NO.... but you can fit a 20 X 1.75 tyre to a 20 inch 'skinny' rim. Likewise, you can fit a 20 X 1 1/8 tyre to standard size Ukai but it don't look right, the rim would ground on the corners and 'heavier' rider would rip it to shreds

Understand now ???

You clearly dont  :LolLolLolLol:
Whats the matter Kid, don't ya like clowns? Don't we make you laugh? Aint we fukkin funny?

Offline Gnarlyscoots

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Re: measuring Wheel Rims - PLEASE HELP
« Reply #23 on: June 30, 2011, 08:18 PM »
True on the TYRE sizes but you wouldn't put a 20 X 1.75 tyre on race rim would you ???


You lost me now. Isn't a comp3 a race tire? What rim are you meant to put a 1.75 Comp3 on, if not a race rim?

You wouldnt put a 20 x 1.75 tire on a "Skinny" (1 1/8 or 1 3/8) rim cos it just wont fit, The rim's dia is way to big
When racing first started, wheel size was 20 inch. You fitted 1.75 tyres on the rear, 2.125 on the front for grip on the corners. As it progressed, wheels got bigger i.e 22 inch and thinner for 'lighter' riders, KIDS etc etc......Tyres had to do the same, obviously. 1.75 tyres are for the 'heavier' racers and 1 1/8 are for 'lighter' racers. You wouldn't see my 14 stone body hacking it round a track with 1 1/8 rims and tyres would you ?? NO......They are for the lighter rider, KIDS.

As for the diameter, or RADIUS, you cannot fit  a 20 X 1.75 tyre to a 21 or 22 inch rim can you ?? NO.... but you can fit a 20 X 1.75 tyre to a 20 inch 'skinny' rim. Likewise, you can fit a 20 X 1 1/8 tyre to standard size Ukai but it don't look right, the rim would ground on the corners and 'heavier' rider would rip it to shreds

Understand now ???

You clearly dont  :LolLolLolLol:
Obviously  :crazy2:
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Offline BMX1973

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Re: measuring Wheel Rims - PLEASE HELP
« Reply #24 on: June 30, 2011, 08:33 PM »
S&MAlex answered it well -  :daumenhoch: cheers mate


Bet the poor bloke is wishing he'd never asked...  ;D

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