has the LBS sold me the wrong tires?
10-01-05, 10:47 AM
#1
Senior Member
Thread Starter
Join Date: Mar 2004
Location: Munich
Posts: 1,372
Bikes: Lemond Alpe d´Huez, Scott Sub 10, homemade mtb, Radlbauer adler (old city bike), Dahon impulse (folder with 20 inch wheels), haibike eq xduro
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
has the LBS sold me the wrong tires?
On looking at Sheldon Brown´s tyre width calculator (https://www.sheldonbrown.com/tire-sizing.html) it appears that the correct width tyre for my Mavic 559 x 17 rims is a tyre with a width of between 25 and 37 mm. I took my bike in and asked my LBS for some light weight MTB tyres and they gave me some 54-559 Schwalbe Black Jack light folding tyres. Obviously the width of these tyres (54mm) is much much higher than recommended by Sheldon. These tyres should be on super wide rims (like Snowcats) according to Sheldons table
So what has happened? have they sold me the wrong tyres? should I go back there and kick their asses?
So what has happened? have they sold me the wrong tyres? should I go back there and kick their asses?
__________________
only the dead have seen the end of mass motorized stupidity
Plato
(well if he was alive today he would have written it)
only the dead have seen the end of mass motorized stupidity
Plato
(well if he was alive today he would have written it)
10-01-05, 11:04 AM
#3
Senior Member
Thread Starter
Join Date: Mar 2004
Location: Munich
Posts: 1,372
Bikes: Lemond Alpe d´Huez, Scott Sub 10, homemade mtb, Radlbauer adler (old city bike), Dahon impulse (folder with 20 inch wheels), haibike eq xduro
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Yes they have been on the bike for a while and they don´t fall off- but if they are in fact the right size how can Sheldon be so wrong?? 
__________________
only the dead have seen the end of mass motorized stupidity
Plato
(well if he was alive today he would have written it)
only the dead have seen the end of mass motorized stupidity
Plato
(well if he was alive today he would have written it)
10-01-05, 11:14 AM
#4
The Improbable Bulk
Join Date: Jul 2005
Location: Wilkes-Barre, PA
Posts: 8,379
Bikes: Many
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Likes: 0
Liked 7 Times
in
7 Posts
Originally Posted by royalflash
Yes they have been on the bike for a while and they don´t fall off- but if they are in fact the right size how can Sheldon be so wrong??
I am not an expert, but I suspect with a tire that wide you are probably limited on the air pressure by the tire manufacturer. I would be extremely cautious about tire pressure... Too much and you could blow the tire off of the rim due to the increased angle between the sidewall and the rim. Too little, and I would fear instability, pinch flats or both.
__________________
Slow Ride Cyclists of NEPA
People do not seem to realize that their opinion of the world is also a confession of character.
- Ralph Waldo Emerson
Slow Ride Cyclists of NEPA
People do not seem to realize that their opinion of the world is also a confession of character.
- Ralph Waldo Emerson
10-01-05, 11:16 AM
#5
Senior Member
Thread Starter
Join Date: Mar 2004
Location: Munich
Posts: 1,372
Bikes: Lemond Alpe d´Huez, Scott Sub 10, homemade mtb, Radlbauer adler (old city bike), Dahon impulse (folder with 20 inch wheels), haibike eq xduro
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
I have usually been running them at the max, i.e. 65 psi
__________________
only the dead have seen the end of mass motorized stupidity
Plato
(well if he was alive today he would have written it)
only the dead have seen the end of mass motorized stupidity
Plato
(well if he was alive today he would have written it)
10-01-05, 11:26 AM
#7
Senior Member
Join Date: Jul 2001
Posts: 1,392
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 140 Post(s)
Liked 0 Times
in
0 Posts
10-01-05, 11:33 AM
#8
Senior Member
Thread Starter
Join Date: Mar 2004
Location: Munich
Posts: 1,372
Bikes: Lemond Alpe d´Huez, Scott Sub 10, homemade mtb, Radlbauer adler (old city bike), Dahon impulse (folder with 20 inch wheels), haibike eq xduro
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Originally Posted by Moose
Assuming this is a mountain bike rim, I cannot imagine it being limited to a 37mm tire width. That's less than 1.5"
the Cannondale Bad Boy has the same rim as I have (Mavix x223 disc) and comes with a 54-559 tyre (26 x 2.10)
https://www.epinions.com/bicycles_200...ay_~full_specs
__________________
only the dead have seen the end of mass motorized stupidity
Plato
(well if he was alive today he would have written it)
only the dead have seen the end of mass motorized stupidity
Plato
(well if he was alive today he would have written it)
10-01-05, 11:53 AM
#9
Senior Member
Join Date: Jul 2001
Posts: 1,392
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 140 Post(s)
Liked 0 Times
in
0 Posts
Originally Posted by royalflash
maybe I just don´t understand Sheldon´s table then- I agree it doesn´t sound right for an MTB rim
If you use a very wide tire on a narrow rim, you risk sidewall or rim failure. This combination causes very sloppy handling at low speeds. Unfortunately, current mountain-bike fashion pushes the edge of this. In the interest of weight saving, most current mountain bikes have excessively narrow rims. Such narrow rims work very poorly with wide tires, unless the tires are overinflated...but that defeats the purpose of wide tires, and puts undue stress on the rim sidewalls.
10-01-05, 07:52 PM
#10
hateful little monkey
Join Date: May 2003
Location: oakland, ca
Posts: 5,274
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
My narrow-ass aero rims are happy with anything from a 700x20 to a 700x52, so I wouldn't worry too much about it.
10-01-05, 11:34 PM
#11
Senior Member
Join Date: Jun 2005
Location: San Diego
Posts: 427
Bikes: Cinelli Unica, BP Stealth, K2 Razorback, Steel Bianchi roadie, Bianchi Super GL, Specialized Stumpjumper, and 3 beach cruisers
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
You're not one of the people posting about all the flats you're getting, and you haven't rolled the thing, so you're fine. Sheldon, like anyone, has his biases. Just because he made a table or a calculator doesn't mean it's an incontrovertible truth.
10-01-05, 11:52 PM
#12
Senior Member
Thread Starter
Join Date: Mar 2004
Location: Munich
Posts: 1,372
Bikes: Lemond Alpe d´Huez, Scott Sub 10, homemade mtb, Radlbauer adler (old city bike), Dahon impulse (folder with 20 inch wheels), haibike eq xduro
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
I do get a lot of flats but not pinch flats as the light Black Jack folding tyres are not puncture resistant at all. They look quite tough and knobbly but they flat on average about once every couple of weeks when I commute on them.
__________________
only the dead have seen the end of mass motorized stupidity
Plato
(well if he was alive today he would have written it)
only the dead have seen the end of mass motorized stupidity
Plato
(well if he was alive today he would have written it)
