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.
Photo by Hendi Kaf, in Cambodia

I haven't been everywhere...
but it's on my list!


Photo by Hendi Kaf,
in Cambodia



Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 19 Aug 2003
Registered Users
HUBB regular
 
Join Date: Dec 2002
Location: Zambia
Posts: 45
Why do wheel sizes vary?

Another Newbie question for you: Why do some big trail bikes have 18" rear wheels and others have 17" rear wheels? What are the advantages of each? I understand why a larger front would be better for off-road, but what about the rear?

I'm considering swapping to an 18" rear for my DAKAR, but wonder if it's worth the trouble.

Hunter
__________________
Hunter
Reply With Quote
  #2  
Old 20 Aug 2003
John Ferris's Avatar
Gold Member
Veteran HUBBer
 
Join Date: Feb 2001
Location: Reno,NV,USA
Posts: 560
The old GS had an 18 inch rear wheel but it had 3 wheel lugs holding it on. The newer GS had a 17 inch rear wheel with 4 wheel lugs.
I think that you would have to change the rear drive.
Reply With Quote
  #3  
Old 20 Aug 2003
Grant Johnson's Avatar
HU Founder
Veteran HUBBer
 
Join Date: Dec 1997
Location: BC Canada
Posts: 7,324
I think Hunter has an F650 Dakar, which comes with a 17. Swapping to an 18" rim is not worth doing. You can, but you'll almost certainly run into clearance problems with the fender.

All new "off-road" bikes and for that matter street bikes are using a 17" rear wheel.

An 18" rear used to be the standard.

Now manufacturers are using 17's primarily because they are using fatter rubber, which gives better traction (because we now have much more power) and a better ride. But fat rubber with an 18" rim makes the rear wheel just plain too tall and very heavy.


------------------
Grant Johnson

Seek, and ye shall find.

------------------------

One world, Two wheels.
www.HorizonsUnlimited.com
__________________
Grant Johnson
Seek, and ye shall find.

------------------------
Inspiring, Informing and Connecting travellers since 1997!
www.HorizonsUnlimited.com
Reply With Quote
  #4  
Old 20 Aug 2003
Registered Users
HUBB regular
 
Join Date: Dec 2002
Location: Zambia
Posts: 45
Thanks guys,

Grant, if the 18" gets in the way of the fender and adds extra weight while screwing up the hight/geometry of an already tall bike, why do I find guys out there swearing by the change to their DAKAR to make it "off road worthy"? Does the larger wheel give improved (or perceived) improvements off road?

I'm pretty sure I'll stick with my 17" wheel. I'll throw on a rimlock and a knobby tire and go for it...my real worry now lies two threads earlier with my FI question.

Cheers,
Hunter
__________________
Hunter
Reply With Quote
  #5  
Old 24 Aug 2003
Grant Johnson's Avatar
HU Founder
Veteran HUBBer
 
Join Date: Dec 1997
Location: BC Canada
Posts: 7,324
If people are DOING it and it works I sure won't argue - but my concerns stand if I was thinking about it for the first time.

True motocrossers are using 19" wheels these days, up from 18".

But for big dual purpose bikes, 17" rules as the standard.

Feel free to go 18", but I wouldn't bother - I suspect that those who swear by it are fairly typical - they put in a lot of work and expense so it HAS to be better. It may well be, and someone who really knows may have been the first and said it was better - so everyone follows. Doesn't mean Joe Average can tell the difference.

Practice with what you have, set it up right and ride and ride and ride.

A great rider on a crap bike will do things that seem impossible and magical to the average rider on a great bike.

------------------
Grant Johnson

Seek, and ye shall find.

------------------------

One world, Two wheels.
www.HorizonsUnlimited.com
__________________
Grant Johnson
Seek, and ye shall find.

------------------------
Inspiring, Informing and Connecting travellers since 1997!
www.HorizonsUnlimited.com
Reply With Quote
  #6  
Old 25 Aug 2003
AliBaba's Avatar
Registered Users
Veteran HUBBer
 
Join Date: Apr 2001
Location: Norway
Posts: 1,379
If you would like to use mx-tyres you will find that most of the manufactures only make them in 18" or 19" so a conversion will give you more tyres to choose from.
I use MT21 (17" - high profile) and find them good but if I have had 18" I could get used tyres (of many types) cheap from a mx-shop.
In some countries (Malawi, Kenya,...) they drive mx/enduro but not big bikes and then 18" it's easier to find then 17".

Yes, it's true that mx-drivers start to use 19" (often with a lower profile) but the enduro drivers still stick to 18" and a higher profile.

Most bikes today come with 17", but eg KTM uses 18".

Is it worth it? I don't think so but you might.... :-)

AliBaba R80GS
Reply With Quote
Reply


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

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


 
 

Announcements

Thinking about traveling? Not sure about the whole thing? Watch the HU Achievable Dream Video Trailers and then get ALL the information you need to get inspired and learn how to travel anywhere in the world!

Have YOU ever wondered who has ridden around the world? We did too - and now here's the list of Circumnavigators!
Check it out now
, and add your information if we didn't find you.

Next HU Eventscalendar

25 years of HU Events
Be sure to join us for this huge milestone!

ALL Dates subject to change.

2025 Confirmed Events:

Virginia: April 24-27
Queensland is back! May 2-5
Ecuador June 13-15
Germany Summer: May 29-June 1
CanWest: July 10-13
Switzerland: Date TBC
Ecuador: Date TBC
Romania: Date TBC
Austria: Sept. 11-14
California: September 18-21
France: September 19-21
Germany Autumn: Oct 30-Nov 2

Add yourself to the Updates List for each event!

Questions about an event? Ask here

See all event details

 
World's most listened to Adventure Motorbike Show!
Check the RAW segments; Grant, your HU host is on every month!
Episodes below to listen to while you, err, pretend to do something or other...

Adventurous Bikers – We've got all your Hygiene & Protection needs SORTED! Powdered Hair & Body Wash, Moisturising Cream Insect Repellent, and Moisturising Cream Sunscreen SPF50. ESSENTIAL | CONVENIENT | FUNCTIONAL.

2020 Edition of Chris Scott's Adventure Motorcycling Handbook.

2020 Edition of Chris Scott's Adventure Motorcycling Handbook.

"Ultimate global guide for red-blooded bikers planning overseas exploration. Covers choice & preparation of best bike, shipping overseas, baggage design, riding techniques, travel health, visas, documentation, safety and useful addresses." Recommended. (Grant)



Ripcord Rescue Travel Insurance.

Ripcord Rescue Travel Insurance™ combines into a single integrated program the best evacuation and rescue with the premier travel insurance coverages designed for adventurers.

Led by special operations veterans, Stanford Medicine affiliated physicians, paramedics and other travel experts, Ripcord is perfect for adventure seekers, climbers, skiers, sports enthusiasts, hunters, international travelers, humanitarian efforts, expeditions and more.

Ripcord travel protection is now available for ALL nationalities, and travel is covered on motorcycles of all sizes!


 

What others say about HU...

"This site is the BIBLE for international bike travelers." Greg, Australia

"Thank you! The web site, The travels, The insight, The inspiration, Everything, just thanks." Colin, UK

"My friend and I are planning a trip from Singapore to England... We found (the HU) site invaluable as an aid to planning and have based a lot of our purchases (bikes, riding gear, etc.) on what we have learned from this site." Phil, Australia

"I for one always had an adventurous spirit, but you and Susan lit the fire for my trip and I'll be forever grateful for what you two do to inspire others to just do it." Brent, USA

"Your website is a mecca of valuable information and the (video) series is informative, entertaining, and inspiring!" Jennifer, Canada

"Your worldwide organisation and events are the Go To places to for all serious touring and aspiring touring bikers." Trevor, South Africa

"This is the answer to all my questions." Haydn, Australia

"Keep going the excellent work you are doing for Horizons Unlimited - I love it!" Thomas, Germany

Lots more comments here!



Five books by Graham Field!

Diaries of a compulsive traveller
by Graham Field
Book, eBook, Audiobook

"A compelling, honest, inspiring and entertaining writing style with a built-in feel-good factor" Get them NOW from the authors' website and Amazon.com, Amazon.ca, Amazon.co.uk.



Back Road Map Books and Backroad GPS Maps for all of Canada - a must have!

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 R80G/S.

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 all over the world with the help of volunteers; 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, or ask questions on the HUBB. 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.




All times are GMT +1. The time now is 00:04.