What rear hub standard is this?
#1
Senior Member
Thread Starter
Join Date: Aug 2015
Posts: 65
Bikes: 1994 KHS Descent, 2016 Motobacon Fantom Pro X9
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 15 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
What rear hub standard is this?
I have a new bike and old understanding of hub and axle standards. I've found that I have a 15mm x 100mm front axle. Easy enough. In the rear, though, I'm not quite sure what I have. The axle is part of the hub, and appears to measure 9mm in diameter. I removed the QR, covered one end of the axle, and used an old spoke to determine the end-to-end width of the axle. It appears to be exactly 145mm. Is 9mm x 145mm actually a spec or am I missing something? 15x100 front and 9x145 rear? I've never heard of that. Should I not count the overlap of the axle with the open dropouts? I think that would make it 135mm, but I'm wondering because I find no wheelsets in that particular combination, making me think I'm doing something wrong. What am I missing?
#2
Senior Member
Join Date: Jul 2015
Location: NW Oregon
Posts: 2,975
Bikes: !982 Trek 930R Custom, Diamondback ascent with SERIOUS updates, Fuji Team Pro CF and a '09 Comencal Meta 5.5
Mentioned: 15 Post(s)
Tagged: 1 Thread(s)
Quoted: 1299 Post(s)
Liked 739 Times
in
534 Posts
more likely a 10mm rear axle... and the rear frame between the dropouts should probably be 142mm, not 145mm... standard MTB is 135mm, 142mm, and a few 150's for DH bikes...... and most 142 and 150 hubs use a 12mm axle...
check the inner diameter of the dropouts.... someone might have swapped out the correct wheel for a lesser unit, etc...
check the inner diameter of the dropouts.... someone might have swapped out the correct wheel for a lesser unit, etc...
Last edited by maddog34; 07-27-17 at 03:05 PM.
#3
Really Old Senior Member
A QR axle tends to be 11mm longer than the drop out spacing, so you likely have 135mm spacing w/10mm axle.
What was/is "standard" hybrid/mb spacing.
What was/is "standard" hybrid/mb spacing.
#4
Senior Member
Join Date: Jan 2012
Location: Ithaca, NY
Posts: 4,852
Bikes: Click on the #YOLO
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 26 Post(s)
Likes: 0
Liked 12 Times
in
12 Posts
Think about it this way- the dimension here is dropout spacing/width. The locknuts touch the inside of the dropouts, the axle protrudes into the fork of the dropout.
In the hub end, this width is often referred to as Over Locknut Dimension or O.L.D.
Of course Sheldon has a page about it- https://www.sheldonbrown.com/frame-spacing.html
In the hub end, this width is often referred to as Over Locknut Dimension or O.L.D.
Of course Sheldon has a page about it- https://www.sheldonbrown.com/frame-spacing.html
#5
FLIR Kitten to 0.05C
Join Date: Sep 2014
Location: Lincoln, Nebraska
Posts: 5,331
Bikes: Roadie: Seven Axiom Race Ti w/Chorus 11s. CX/Adventure: Carver Gravel Grinder w/ Di2
Mentioned: 30 Post(s)
Tagged: 0 Thread(s)
Quoted: 2349 Post(s)
Liked 406 Times
in
254 Posts
more likely a 10mm rear axle... and the rear frame between the dropouts should probably be 142mm, not 145mm... standard MTB is 135mm, 142mm, and a few 150's for DH bikes...... and most 142 and 150 hubs use a 12mm axle...
check the inner diameter of the dropouts.... someone might have swapped out the correct wheel for a lesser unit, etc...
check the inner diameter of the dropouts.... someone might have swapped out the correct wheel for a lesser unit, etc...
All About Thru Axles - Fairwheel Bikes Blog
And that is not an inclusive list.
#7
Senior Member
Join Date: Nov 2014
Location: Eugene, Oregon, USA
Posts: 27,547
Mentioned: 217 Post(s)
Tagged: 0 Thread(s)
Quoted: 18376 Post(s)
Liked 4,511 Times
in
3,353 Posts
For a standard quick release axle, the axle would be about 10mm longer than the OLD distance.
So, a 145mm axle would be for a 135mm OLD frame.
There are some tandems that use 145mm OLD hubs.
So, a 145mm axle would be for a 135mm OLD frame.
There are some tandems that use 145mm OLD hubs.