Go Back   Horizons Unlimited - The HUBB > Technical, Bike forums > BMW Tech

BMW Tech BMW Tech Forum - For Questions specific and of interest to BMW riders only. Questions comparing which bike is best etc go in the "Which Bike" forum.
Contact Overland Solutions for all your custom modifications and setup for overland travel.

7 Litre Camel Tank Lets You Explore More, Click to Find out More!

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 4 Apr 2007
Registered Users
HUBB regular
 
Join Date: Jul 2006
Location: India for the winter...
Posts: 23
Exclamation Scary-drum brake & Spoked wheels

hello all,
I just wanted to find out if anyone else came across this dangerous problem before.
One evening as i was riding down a steep driveway my back wheel totally locked up.....its an R80GS.
After falling off at low speed i noticed one broken spoke. After further inspection i found the spoke had broken at the nipple threaded into the wheel rim. The nipple had fallen into the drum brake and locked it......
Seriously scary stuff.
Thank god i was only doing 2 or 3 miles an hour.
Has anyone had this problem before???? a serious design flaw?
I had been doing alot of rough riding in woods around europe fully loaded on high tyre pressures so i could understand a broken spoke after lots of this riding.....but with such consequences?
Any thoughts?
Reply With Quote
  #2  
Old 5 Apr 2007
Dean de St Croix's Avatar
Registered Users
HUBB regular
 
Join Date: Sep 2006
Location: Southern Ontario
Posts: 33
Question?

The spoke broke at the nipple (this is common for a spoke to brake at either the bend or the beginning of the threads - at the weakest point)

- you said the nipple then fell into the drum? How did it get out of the rim? Did it pull through or crack? it would still be in the rim right?

I have had brakes lock for a number of reasons as even a broken spring inside a drum can lead to a lock up or brake arm movement can spin the brake hub and lock. Scary stuff but still pretty rare.

I suspect the reason for the lock-up was the low speed as any amount of rpm of the wheel would have cracked the hub/brake plate spacing or crushed the nipple end as they are quite soft (so-to-speak). Before tossing you - unless you were in a turn with a slippery surface.

But, you never know.

Seems like a very unlucky coincidence.

Dean
Reply With Quote
  #3  
Old 5 Apr 2007
Registered Users
Veteran HUBBer
 
Join Date: Jun 2005
Location: Cape Town / South Africa
Posts: 223
On the GS the spokes on the right is fed through the inside of the hub, so what was most likely meant was that the spoke fell into the drum brake and not the nipple.
Reply With Quote
  #4  
Old 5 Apr 2007
Registered Users
Veteran HUBBer
 
Join Date: Feb 2006
Posts: 1,508
Quote:
Originally Posted by gsworkshop View Post
On the GS the spokes on the right is fed through the inside of the hub, so what was most likely meant was that the spoke fell into the drum brake and not the nipple.
Hmm, another bmw 'characteristic'
Reply With Quote
  #5  
Old 6 Apr 2007
Registered Users
HUBB regular
 
Join Date: Jul 2006
Location: India for the winter...
Posts: 23
Sorry i should have said,
part of the nipple broke and fell into the hub, the bit of the nipple left in the rim was deformed and broken. the spoke also broke at the just where the threads enter the nipple. (maybe when the spoke broke the force also broke the nipple...)
The part of the nipple left in the rim protrouded into the hub thus damaging the brake shoe as i braked going down the hill, the loose part in the hub seemed to have jammed between the hub wall and the shoes.......thus jamming the wheel.
To be honest this happened a few months ago but this is what happened as i recall. I just wanted to see if anyone else had heard of, or had this happen to them,,,,,,
I can imagine brake internals jamming in the hub also......god those bloody drum brakes.....
Reply With Quote
  #6  
Old 6 Apr 2007
Registered Users
Veteran HUBBer
 
Join Date: Jun 2005
Location: Cape Town / South Africa
Posts: 223
I guess it is a Paralever GS with the tubeless rim. These were fitted with a stainless steel spoke and due to the high chrome content in stainless steel it is more brittle and weaker than steel spokes.
When fitting Stainless spokes it is common to use much thicker spokes to compensate for its weaker structure.
On the tubeless rim the nipple is not mounted on the rim but rather on the hub with the head of the spoke being held in the rim sidewall. Sorry for the confusion earlier about what part should end up in the brakes as with the older type tubed wheel it would be impossible for the nipple to find it's way into the hub.
The safe solution for your problem would be to fit normal steel spokes but I am not sure you can find this from BMW and besides they seem to have a serious problem with corrosion on the steel spokes fitted to older bikes at this time.
Reply With Quote
  #7  
Old 8 Apr 2007
Registered Users
HUBB regular
 
Join Date: Jul 2006
Location: India for the winter...
Posts: 23
yes gsworkshop your quite right it is the tubless paralever....interesting about the s/s spokes..
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 Registered Users and/or Members and 1 guests)
 
Thread Tools
Display Modes

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
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
86 XL600 Drum to Disc Brake Conversion belly Travellers' questions that don't fit anywhere else 6 15 Nov 2006 00:10
Honda Wheels (Dommie / XR6) POB/London Honda Tech 4 19 Jul 2006 04:11
rear drum brake lining zebra Yamaha Tech 2 1 May 2005 03:38
Rear disc brake Mark Yamaha Tech 4 28 Sep 2004 19:57
When spoked or cast wheels? STEVE B Equipping the Bike - what's the best gear? 5 14 Feb 2002 18:23

 
 


HU DVD Summer Special!

Now that summer is here, get On the Road! Take 30% off the Achievable Dream - On the Road! 2-DVD set until August 31 only. Get On the Road! Learn the tips to staying healthy, happy and secure on your motorcycle adventure!

Our veteran travellers share their tips (and great stories) for staying healthy, happy and secure on your motorcycle adventure.

"A fantastic, informative and inspirational DVD."

"It's brilliant - thank you very much!"

Check it out at the HU Store! Remember to use Coupon Code 'ONTHEROAD' on your order when you checkout.


Renedian Adventures


Renedian Adventures

What others say about HU...

"I just wanted to say thanks for doing this and sharing so much with the rest of us." Dave, USA

"Your website is a mecca of valuable information and the DVD series is informative, entertaining, and inspiring! The new look of the website is very impressive, updated and catchy. Thank you so very much!" Jennifer, Canada

"...Great site. Keep up the good work." Murray and Carmen, Australia

"We just finished a 7 month 22,000+ mile scouting trip from Alaska to the bottom of Chile and I can't tell you how many times we referred to your site for help. From how to adjust your valves, to where to stay in the back country of Peru. Horizons Unlimited was a key player in our success. Motorcycle enthusiasts from around the world are in debt to your services." Alaska Riders

contest pic

10th Annual HU Travellers Photo Contest is on now! This is an opportunity for YOU to show us your best photos and win prizes!

NEW! HU 2014 Adventure Travel T-shirts! are now available in several colors! Be the first kid on your block to have them! New lower prices on synths!

HU 2014 T-shirts now in!

Check out the new Gildan Performance cotton-feel t-shirt - 100% poly, feels like soft cotton!


What turns you on to motorcycle travel?


Global Rescue, WORLDwide evacuation services for EVERYONE

Global Rescue is the premier provider of medical, security and evacuation services worldwide and is the only company that will come to you, wherever you are, and evacuate you to your home hospital of choice. Additionally, Global Rescue places no restrictions on country of citizenship - all nationalities are eligible to sign-up!


New to Horizons Unlimited?

New to motorcycle travelling? New to the HU site? Confused? Too many options? It's really very simple - just 4 easy steps!

Horizons Unlimited was founded in 1997 by Grant and Susan Johnson following their journey around the world on a BMW R80 G/S motorcycle.

Susan and Grant Johnson Read more about Grant & Susan's story

Membership - help keep us going!

Horizons Unlimited is not a big multi-national company, just two people who love motorcycle travel and have grown what started as a hobby in 1997 into a full time job (usually 8-10 hours per day and 7 days a week) and a labour of love. To keep it going and a roof over our heads, we run events (22 this year!); we sell inspirational and informative DVDs; we have a few selected advertisers; and we make a small amount from memberships.

You don't have to be a Member to come to an HU meeting, access the website, the HUBB or to receive the e-zine. What you get for your membership contribution is our sincere gratitude, good karma and knowing that you're helping to keep the motorcycle travel dream alive. Contributing Members and Gold Members do get additional features on the HUBB. Here's a list of all the Member benefits on the HUBB.


Books & DVDs

amazon

All the best travel books and videos listed and often reviewed on HU's famous Books page. Check it out and get great travel books from all over the world.


Motorcycle Express for shipping and insurance!

Motorcycle Express

MC Air Shipping, (uncrated) USA / Canada / Europe and other areas. Be sure to say "Horizons Unlimited" to get your $25 discount on Shipping!
Insurance - see: For foreigners traveling in US and Canada and for Americans and Canadians traveling in other countries, then mail it to MC Express and get your HU $15 discount!




All times are GMT +1. The time now is 20:59.