Inch equivalent of 650b?

[hsmitham]

Hey new to the 650b size. Went to SB web site and found this sizing equivalent for the french utility size.

26 x 1 1/2 (650B)

584 mm

French utility, tandem and loaded-touring bikes, a very few Raleigh (U.S.) & Schwinn mountain bikes.

So if I purchased a Schwalbe Marathon wire GreenGuard HS420 in 26x1 1/2  it should work right? Just want to be sure before I pull the trigger. Thanks in advance for holding my hand :)

Hugh

Sunland, Ca

[hsmitham]

Update: I think the important part of the sizing 1 1/2 is not the equivalent of 1.5 does that sound right?

Hugh

Sunland, Ca

[Kenneth Stagg]

Not so sure about that.  Looking at Schwalbe's website I don't see that size listed.  They do show a 584 but it's a 1.65 (650 x 42b):

http://www.schwalbetires.com/bike_tires/road_tires/marathon_420

 

-Ken

 

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[Michael]

 

You cannot use a 26" tire of any width/dimension for a 650b wheel because the Bead Seat Diameter is 584 for a 650b wheel, and 559 for 26" wheels. That's the part of the wheel where the bead of the tire clinches onto the hook of the rim.

 

You need a 650b (584) size tire. Rivendell Bike Works sells the same tire in 650b. Get 'em while they are available.

 

Also note that a 650c tire will not work either on a 650b rim, as that diameter is different, too.

 

It is funny though how a 650b wheel and tire measures 26.5" from the ground though.

[Michael]

Go here and scroll down the drop down menu and select "650b x 42.

 

That will work with 650b wheels. Its that 584 measurement that counts. Make sure whatever you get says "584" on it.

 

 http://www.rivbike.com/product-p/t001.htm

[Kenneth Stagg]

Michael,

26" tires come in various bead seat diameters. Mores the pity. As
Steve pointed out the fractional width <> decimal width. That's why
it's always best to use the ETRTO size so you know what you're
getting.

-Ken

[Michael]

hssmitham:

 

You would also do well to get an extra 650b wheelset/rims when the wallet allows. If you don't have a 650b friendly shop nearby, the wait time for rims can be llloooooonnnnnnggggg if you ever need a replacement.

[Steve Palincsar]

Last two rims I had replaced were a Velocity Synergy in 650B and a Mavic
Open Pro. It took a month just to get the Open Pro; Velocity rebuilt
and returned my 650B wheel in a week. The Open Pro replaced a cracked
MA3, and I had to pay for the whole thing myself, while Velocity
replaced the cracked Synergy and rebuilt the wheel for free.

[Mike Schiller]

Hugh, that is the equivalent size to ERTO 584mm.  The Schwalbe's are very durable but most feel they ride very "dead"  compared to the Hetres you've been riding. Perhaps a better tire is the Soma B-line. Unless you want the reflective stripe of the Schwalbe's. 

~mike

On Wednesday, February 13, 2013 2:49:09 PM UTC-8, hsmitham wrote:

[Steve Palincsar]

On Wed, 2013-02-13 at 14:55 -0800, hsmitham wrote:
> Update: I think the important part of the sizing 1 1/2 is not the
> equivalent of 1.5 does that sound right?

26 x 1 1/2 is bead seat diameter 584. 26 x 1.5 is bead seat diameter
559. Those two are /very/ different.

The fractional inch size is NEVER equivalent to the decimal inch size.

[dougP]

"26" tires come in various bead seat diameters."

Including one the British used as well as the infamous proprietary Schwinn size.  And now the MTB world has "discovered" 650B but just to keep it interesting they're calling it 27.5. 

dougP

[hsmitham]

Wow thanks for the responses.

 Mike I want the Schwalbe's to thwart the goat heads when I go with you fellows on mixed terrain rides. I plan on using the hetres for most of my riding, tour, commute, ect…I also plan on having another wheel set built by Rich in the distant future, wife has needs tooJ

 

I would purchase the Schwalbe’s today if Riv had them, talked to them today and they won’t have any till mid March! Ironically, when I was having the bike built it was spec’d with the Marathons and I instead supplied the Hetres, oh the humanity. I asked Mark and he confirmed my suspicion that they have a limited number of the Marathon 650b’ reserved for builds. So I’ve been looking elsewhere.

 

The Sheldon Brown site which I posted an excerpt from states that the 26 x 1 ½ is equivalent to a 650b which is 584mm. I realize that you can’t use a decimal equivalent in place of a fractional. I have yet to find anyone on the web selling this size. So I am now entrenched in the 650b world and all it peculiarities.

 

Hugh

Sunland, Ca

[Mike Schiller]

another option is the new "super" puncture resistant Fatty Rumpkins ( according to the SomaFab blog).

~mike

[Jim Thill - Hiawatha Cyclery]

26x1-1/2 was the more commonly ussd designation for the wheel size used by Schwinn and Raleigh on their 80s MTBs. It's the same as 650b. As was mentioned earlier, decimal sizes are never the same as fractional sizes. The best bet is to always check bead seat diameter. 584 for 650B, 590 for 26x1-3/8, 559 for 26xdecimal, plus 571 and 597 and some other oddballs that may cause 26 or 650 confusion.

[Michael]

The only downside to 650b is the lack of choices for wheels and tires and the lack of availability when you want/need it.

 

I got Hetres after waiting for months for the Marathons to come back in stock.

I got one Marathon thru the forum, and will get another when they come back in stock sometime so I have a set.

 

But if the Hetres prove to be puncture resistant enough I might just stay with them. They are supposed to be one of the fastest 650b tires around, too.

[dougP]

Hugh:

Some of the confusion is a result of the amount of information Schwalbe provides.  Note for the tire you are considering the ERTO column is "44-584" indicating a nominal 44 mm width and a 584 mm bead seat diameter (the really important number as this must be the same as the wheel size.)  The next column (labeled "size") lists both "26 x 1.65" and "650 x 42b".  Schwalbe commonly lists their tires with multiple sizing information for reasons unknown to me.  You just have to be careful to get the 584 mm BSD.  The tire will most likely be quite chubby so don't get hung up on the width.  Besides, it will be just be blind luck of the inflated width matches any of the numbers on the sidewall :-). 

You mention goat head protection.  We've got a month or 2 here in So Cal before we get into serious goat head season.  But David did lead us along the trail of a million goat heads on one of the Redlands rides, resulting in an unusually large number of flats.  My Schwalbes were of course immune. 

dougP

On Wednesday, February 13, 2013 2:49:09 PM UTC-8, hsmitham wrote:

[C.J. Filip]

That and they (Hetres) fit PERFECTLY under SKS p50 fenders on Riv 650b
bikes.

On Feb 13, 7:52 pm, Michael <john11.2...@gmail.com> wrote:
> > The only downside to 650b is the lack of choices for wheels and tires and

[PATRICK MOORE]

I'd be interested to hear how the Marathon Green Guards ward off goatheads. I know that a combination of extra thick "thorn proof" tubes, a belted tire, and a thick Mr Tuffy strip can make a tire well-nigh immune, but at the cost of any riding pleasure. I wonder if the MGGs roll decently yet remain impervious?

Out here in ABQ, NM, local riders tell me that Stan's has "solved" the goathead problem, even for tubular tires -- the downside is that it dries out so that you eventually build up little 2 oz clumps of dried sealant in your tire, how much depending on how long before you wear it out. I am waiting for a discount bulk bottle to try in my tubs and also in my Big Apple tubes. (I know that Stan's was developed for tubeless off road tires.)

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[Montclair BobbyB]

Boy we make our world so confusing!!!  Thankfully I can always consult Sheldon Brown to keep all the various ETRTOs straight in my head.

For simplicity sake it can be useful to think of it in mountain bike terms, where the world is largely divided up between 26 inch and 29 inch wheels, with the new emerging (650B) standard splitting the difference at 27.5 inches.

BB

[Michael]

My Hetres fit perfecty under my SKS P45 Longboards.

[Jan Heine]

I am with Sheldon. At Bicycle Quarterly, we use the ETRTO measurements
(with the traditional measurements in parentheses). That way, it all
makes sense:

559 mm (26")
584 mm (650B, 27.5")
622 mm (700C, 29")
630 mm (27")

All the other sizes don't really matter anyhow. The mountain bike
sizes add another layer of confusion: 27.5" is NOT half-way in between
26" and 29", and the old 27" size is bigger than the new 29"... But I
guess "tentyseven-five" sounds a lot cooler than 584 mm.

Jan Heine
Editor
Bicycle Quarterly
http://www.bikequarterly.com

Follow our blog at http://janheine.wordpress.com/

On Feb 14, 3:23 pm, Montclair BobbyB <montclairbob...@gmail.com>
wrote:

[Steven Frederick]

Soma has a new version of the Fatty Rumpkin with a puncture proof layer--the "toughest 650b touring tire around."  Scroll down a bit here:

http://www.somafab.blogspot.com/

Skinwall mtb tires, too! 

I'm sure Riv will have one or both of these products soon if you prefer to shop on topic.

Steve

--

[William]

Even if they don't, they do.  Rivendell will sell you anything that Merry Sales sells, if you want to go that route.  Your local bike shop with a Merry Sales account also can do the same.  Everything Soma is available from Merry Sales. 

Maybe when I wear out some of the 650B New Express tires I'm running I'll splurge on some super stout Fatties Rumpkin

[Jim Thill - Hiawatha Cyclery]

Several years ago, I had a guy come into the shop looking for a tube for a 28x1-5/8x1-1/4, which he'd written down from his tire or old tube. I believe Continental and Schwalbe print this somewhat archaic Northern European size on their 700C/622 tires, so the confusion is understandable. But they're all the same 700C.

Anyway, 700C tubes also work on 27" tires, and say so in the box. The dude saw the 27" label and didn't believe me that 27" was somehow the same as 28" (for tubes anyway). I tried to reassure him several times, but he wasn't buying it. I think he thought I was conning him. I'm embarrassed to say that I was already having a hectic day, and my usual infinite patience quickly grew thin arguing with him. I snatched the tube out of his hand, said something profane, and told him to find his 28" tube elsewhere. I feel bad for losing my cool with the guy, but at the same time I think it's kinda funny in terms of the confusion that arises from the ridiculousness of competing tire size schemes.

[Mitchell Gass]

At 02:49 PM 2/13/2013, hsmitham wrote:
>Hey new to the 650b size. Went to SB web site and found this sizing
>equivalent for the french utility size.
>

>26 x 1 1/2 (650B)584 mmFrench utility, tandem and loaded-touring bikes,

>a very few Raleigh (U.S.) & Schwinn mountain bikes.
>
>So if I purchased a Schwalbe Marathon wire GreenGuard HS420 in 26x1
>1/2 it should work right? Just want to be sure before I pull the
>trigger. Thanks in advance for holding my hand :)

The ETRTO size should be on the sidewall. If it's 38-584 - or
[something else]-584 - you've got a 650B tire.

Mitchell Gass

[hsmitham]

Hi Fellows,

Thanks for the advice, really helpful.

Hugh

Sunland, Ca