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Old 01-06-07, 04:27 AM   #1
brainchopper
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24x4-1/4 tires finally available

Yes, finally, 24x4-1/4 bicycle tires are available. Your familiar with the new Schwinn Stingray? It has a 20x4-1/4 tire on the rear. The 20 inch size is great for kids but not so great for adults! Think of a 24 inch wheel with 4 inches of tread on it! It's a monster, and gives a real mean look to a bike. The tires are being offered through "Firebikes" in Saskatchewan Canada! Firebikes has been selling kustom frames and parts throughout the world for a number of years, and has a great reputation.

Wide 24 inch rims in both 80mm and 100mm are available through "Firebikes" or "ChoppersUS". Wide hubs off of the Stingray (and it's clones) can be used together with these rims and tires. The best wide hub to get is the Sturmy Archer 3 speed hub "SXR-B3" (found on some of the new Stingrays), this hub will give more than enough chain line clearance for this super wide combination.

Wide bottom brackets are available though "Sickustoms" and should also be available at ChoppersUS. "Sickustoms" also sells parts to make multispeed jack-shaft assembly's that can also be used for adapting wide rear wheels.

"Firebikes" tire announcement (with photo's) can be found here: http://www.chopperbicycle.net/forums...ead.php?t=2628

Chopperbicycle.net is a web forum devoted primarily to chopper bicycles and related topics.

"Firebikes", "ChoppersUS", and "Sickustoms" are all members of Chopperbicycle.net, and all have contact information available there. For those that like wide rear tires this is the place to get information on where to get them ,and how to put them on a bike.

All the best

John Brain
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Old 01-21-07, 08:33 AM   #2
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I just got my new 24x4 tires delivered a couple of days ago. Here is a photo showing a 24x4-1/4 tire on a 100mm wide rim, next to a 24x3 tire on an 80mm rim:




This photo shows how much bigger the 24x4 tire is next to a 20x4 tire. The 24x4 is a real adult size peice of rubber.




Here are some numbers for people who need them, I tried to be as exact as possible, but I'm not perfect.

These specs are for a "Firebikes" 24x4-1/4, and a 24x3 (Kenda) tire, when mounted and inflated on both 80 and 100mm rims.

I first measured the tread width on the bare unmounted tires, flattening the tread with my hand while measuring. This way the 24x3 Kenda had a tread width of 2-7/8 inches, while the "Firebikes" 24x4-1/4 had a tread that was 4-1/2 inches!
--------------------------------------------------------------------------------------------------------


The 24x3 Kenda mounted on a Rigida 80mm rim:
-Height: (inflated): 66cm (26 inches)
-Width: ( sidewall greatest) 9cm (3-1/2 inches)
-Tread: width (curved inflated) 2-3/4 inches

(sidewall is wider that the tread) Tread is very flat almost like a slick.
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


The 24x4-1/4 tire mounted on an 80mm Rigida rim:
-Height: (inflated) 66.8cm (26-3/8 inches)
-Width: (greatest) 9.9cm ( 3-7/8 inches)
-Tread: width 9.9cm (3-7/8 inches)

(Gives very rounded tread profile, great for a fat front tire)
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

The 24x4-1/4 mounted on a Rigida 100mm rim:
- Height: (inflated) 66.6cm (26-1/4 inches)
- Width: (Greatest, sidewall) 10.5cm (4-1/8)
- Tread: 10cm (4 inches)

(sidewall appears to be just slightly wider than the tread)
Tread profile is roundish and full width, similar to motorcycle road racing tires.
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Like I said, I tried to be accurate, it's as close as I could get. I hope the information is helpful. Over or under inflation will affect these numbers slightly.

Keep building the best! 2007 is going to be a good year!

Sincerely

John Brain
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