Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 05-21-09, 06:00 PM   #1
icaruswasright
Junior Member
Thread Starter
 
Join Date: Nov 2008
Location: Alaska
Bikes:
Posts: 17
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
spoke pattern for 40h hi-lo rear hub

I'm having a set of indestructable post-apocolypse wheels (40h maxi-car hubs, 26" velocity aeroheat rims, 14/15 wheelsmith spokes) built. I originally had the parts sent unbuilt from yellow-jersey, who kindly calculated spoke lengths for me (the equation at the back of jobst's book has like 10 variables!). When I went to build the wheels though I realized I was in a bit over my head and decided to have them built at the lbs. They got the front wheel together, but the rear hub has high-low flanges, and they say that you cannt use a cross-four patter on a small flange. I believe this is becaus ethe spokes overlap. What spoking pattern should be used in this situation? Maxi-car would not have made the hubs if they were unbuildable.

(p.s. I also am awaiting a reply from andy muzi at yellow-jersey, so a definitive answer is forthcoming, but I still want to hear what you all think)
icaruswasright is offline   Reply With Quote
Old 05-21-09, 06:30 PM   #2
mrrabbit 
Senior Member
 
mrrabbit's Avatar
 
Join Date: Dec 2007
Location: San Jose, California
Bikes: 2001 Tommasini Sintesi w/ Campagnolo Daytona 10 Speed
Posts: 3,190
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Should work just fine with 4X - like most 40 and 44 hole wheels. 3X cross should work as well...either side.

=8-)
mrrabbit is offline   Reply With Quote
Old 05-21-09, 11:33 PM   #3
Jeff Wills
Insane Bicycle Mechanic
 
Jeff Wills's Avatar
 
Join Date: Mar 2008
Location: other Vancouver
Bikes:
Posts: 7,942
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 15 Post(s)
Quote:
Originally Posted by icaruswasright View Post
I believe this is becaus ethe spokes overlap. What spoking pattern should be used in this situation? Maxi-car would not have made the hubs if they were unbuildable.
4X on small flanges can cause a spoke to cross over the adjacent spoke's head. This makes it difficult to replace a spoke, but it's by no means "unbuildable". I'd still go 3X on both sides- you won't notice the difference.
__________________
Jeff Wills

Comcast nuked my web page. It will return soon..
Jeff Wills is offline   Reply With Quote
Old 05-21-09, 11:37 PM   #4
urbanknight
In beaurocratic limbo
 
urbanknight's Avatar
 
Join Date: Mar 2006
Location: Los Angeles, CA
Bikes: Specialized Allez, K2 Razorback
Posts: 22,456
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Jeff Wills View Post
4X on small flanges can cause a spoke to cross over the adjacent spoke's head.
True, but I highly doubt that would be the case with 40h hubs.

OP: Did you buy the spokes in the length for 4x? If so, build with that.
__________________
"Well, I guess you can cut the arts as much as you want... Sooner or later, these kids aren't going to have anything to read or write about." (Richard Dreyfus as Glenn Holland)
urbanknight is offline   Reply With Quote
Old 05-21-09, 11:47 PM   #5
Jeff Wills
Insane Bicycle Mechanic
 
Jeff Wills's Avatar
 
Join Date: Mar 2008
Location: other Vancouver
Bikes:
Posts: 7,942
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 15 Post(s)
Quote:
Originally Posted by urbanknight View Post
True, but I highly doubt that would be the case with 40h hubs.
Yes, but... 4X 40h on 26" rim?

BTW: if you frequent Open Road Bicycles on Sierra Madre, tell Steve that "Big Jeff" says Hi...
__________________
Jeff Wills

Comcast nuked my web page. It will return soon..
Jeff Wills is offline   Reply With Quote
Old 05-21-09, 11:48 PM   #6
Sixty Fiver
Bicycle Repair Man !!!
 
Sixty Fiver's Avatar
 
Join Date: Sep 2007
Location: YEG
Bikes: See my sig...
Posts: 27,262
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
The 4 cross pattern on a low flange hub can cause one spoke to cross the head of the adjacent spoke which can cause stress risers that can lead to spoke breakage.

Buildable...yes.

Good... no.

A 3 cross wheel will be plenty strong if it is properly built.
Sixty Fiver is offline   Reply With Quote
Old 05-22-09, 04:21 PM   #7
Gonzo Bob
cycles per second
 
Gonzo Bob's Avatar
 
Join Date: Oct 2003
Location: Minnesota
Bikes: Vitus Aluminum, DiamondBack Apex, Softride Powerwing 700, "Generic" Ishiwata 022, Trek OCLV 110
Posts: 1,790
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
My 36-hole 26" MTB rear wheel was built (at the factory) 4x using low flange Deore hubs. There's just a little bit of spoke head overlap but it's been no problem to remove and replace broken spokes (just a couple in 22+ years). There may no spoke head overlap at all with 40 4x spokes and low flange.
Gonzo Bob is offline   Reply With Quote
Old 05-22-09, 04:59 PM   #8
Sixty Fiver
Bicycle Repair Man !!!
 
Sixty Fiver's Avatar
 
Join Date: Sep 2007
Location: YEG
Bikes: See my sig...
Posts: 27,262
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Quote:
Originally Posted by Gonzo Bob View Post
My 36-hole 26" MTB rear wheel was built (at the factory) 4x using low flange Deore hubs. There's just a little bit of spoke head overlap but it's been no problem to remove and replace broken spokes (just a couple in 22+ years). There may no spoke head overlap at all with 40 4x spokes and low flange.
The only factory mtb wheels I have seen with 4x patterns are mid eighties Kuwaharas but they use a high flange Sansin hub.

I have two customers who have been riding their bikes for 20 years and have yet to break a spoke or have any need to get their wheels trued.

Both are at a point where they have almost worn out the stock Araya RM20 wheels so at some point I will be rebuilding these for them.

My Kuwahara has a 36 spoke 4 cross on a Formula track hub (rear) and there are no crossover issues.

Not every low flange hub will have issues but if there is spoke overlap, then a 3 cross wheel should be built.
Sixty Fiver is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 08:08 AM.