Have questions or want to discuss cycling? Join Now or Sign In to participate in the BikeRide community.

New: Take part in the July Giveaway for a brand new 26" Thruster® Street Style BMX Cruiser Bicycle


Strange Behavior
#1
Same tire & tube. (An old Specialized Crossroads 26x1.95")
Two different (559mm) front wheels, both bolted axles, one is 26mm external rim width, the other is 32mm.
The tire is fine on the 32mm wide rim, you can see a tiny bit of lateral run out, but nothing you would give a second thought to on a commuter/utility bike that never breaks 20mph.
When mounted on the narrower rim it's a mess. The lateral run out is awful, no way would you ride it. There's even a strange large cupped area at the sidewall/tread junction.
No matter how many times I remount, re-position the tube, fuss with the bead and pop air in the tire fast, I can't get it to behave.
A Schwalbe 26x2.125 tire is fine on this narrow rim. The offending Specialized tire is fine when remounted on the wider rim.
Frustrating.
  Reply
#2
Which Specialized? Is it an Armadillo?

The Armadillos have a very rigid protection layer under the tread, which does not like to be deformed - it will rip the tire apart if it is. Armadillos have a MINIMUM inflation pressure specified on the sidewall; I suspect for this very reason.
Nigel
  Reply
#3
It's an old discontinued tire. I believe you are correct, the narrow rim has a deformation at the lip which (which I can't see) that is pulling on the more rigid structure of the Specialized & deforming it, while the Schwalbe tire just stretches & accommodates it.
I don't have any more spare bolted front wheels and I need the wider one to go back on another frame. It's a pity, I really like that Specialized tire. It is old, no cracks in the sidewall, marked Crossroads EX. The protection is labeled "Flak Jacket".
The sidewall actually only measure 47mm wide, the tread lugs make it look wider. A narrow, tall, center "zig zag" belt of tread makes the ride responsive, and feels quick while still giving a hint of cushion.
Was that silver front wheel from your Green Bike bolted or QR?
  Reply


Possibly Related Threads...
Thread
Author
Replies
Views
Last Post
 
4,010
12-10-2017, 02:46 PM
Last Post: garrett01
 
6,720
11-11-2012, 08:06 PM
Last Post: GeorgeET
 
4,079
01-21-2012, 12:02 PM
Last Post: MaccyDG
 
10,990
05-26-2011, 11:04 AM
Last Post: Dalton2250
 
4,916
12-10-2010, 07:42 AM
Last Post: cyclerUK

Forum Jump:

[-]
10 Latest Posts
FD cable pull on opposite side of frame
Today 08:32 PM
Pinging noise fixed
Today 04:34 PM
Specialized Allez Upgrade
Today 09:34 AM
26" Thruster® Street Style BMX | July 20...
Today 09:16 AM
Where are you from and What is your favo...
Today 02:41 AM
The Last Dance - ESPN
Today 02:15 AM
What would be a fair price for this?
Yesterday 03:13 PM
60s Viner Repainted..?
Yesterday 02:29 AM
Need help finding a new rear derailleur
07-05-2020 05:05 PM
2020 road cycling season
07-04-2020 07:18 PM

[-]
Top 5 Posters This Month
no avatar 1. Jesper
65 posts
no avatar 2. CharleyFarley
18 posts
no avatar 3. Painkiller
15 posts
no avatar 4. Papa Dom
10 posts
no avatar 5. G_M
7 posts