20 inch front wheel good or bad idea?

2 replies to this topic
  • djo269

Posted August 25, 2005 - 12:26 AM


Do any of you yz450 owners have a 20 inch front wheel on your bike? What are the positives and negatives for having a smaller wheel? thanx

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • grayracer513

Posted August 25, 2005 - 06:47 AM


The 20" wheels were originally introduced to use a larger section front tire without changing the overall diameter, much as the 110/90x19 was created in order to use a lighter rear tire with the same contact and overall diameter as a 110/100x18. I had one on my brand new '71 BSA B50MX, and the bike worked fine with it. I can't honestly compare it to a 21", because I've never had both on the same bike. A much cheaper and less permanent mod you can try now is to go with one of the larger 90/100x21 tires now available. They are supposed to work well on a YZF, but again, I have not personally tried one.

  • DaveJ

Posted August 25, 2005 - 10:03 AM


Another consideration are the Dunlop 739 F and Gs. Not to be confused with a standard production 739.

The front is a smaller diameter with a stiffer sidewall, which makes for faster and sharper turn-ins.

I was really impressed with how much of a difference it makes.

I used to run nothing but 756s, which is a softer compound, but the special production 739s out performed the 756s. The one exception would be concrete starts.

Most dealers don't seem to know of these tires or think to recommend or ask about your needs, so you really have to press the issue and either insist or ask that they be ordered. About the same price as the others as well.

I know the 739s have taken some flack on TT in the past, but trust me, at the proper tire pressure, these tires are really hard to beat.


Related Content


Wilson the Blue Privateer by jetfuel

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  50 replies

Snake pit oct 30th by The Anvil

Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  293 replies

Yamaha YZ450F 2017 by Chris.GVS

Yamaha YZ450F 2017
  • * * * * *
  • 1 review
  • Last review by Tommyk_55
  • On January 15, 2017

Chubby dad, looking at bikes , First trip to the orange/black forum ! by Slow_ride

Dirt Bike   Make / Model Specific   KTM   250-530 EXC/MXC/SXC/XC-W/XCR-W (4-Strokes)
  • Hot  28 replies

James Stewart back on a YZ450F by YamaLink

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  47 replies

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.