Jump to content

  • Follow us:

  • Facebook
  • YouTube
  • Twitter
  • Google+
  • Instagram
  • RSS Feed
  • Google+




Related Garage

2008_Honda_CRF_150RExpert.jpg

Honda CRF150RB Expert (2008)


Owner: Pablo171
Added on October 21, 2016


Related Reviews

Honda CRF150RB Expert 2014


Last review by yankeekid51
* * * * *

Honda CRF150R 2009


No reviews available
Be the first to review this

Honda CRF150R 2013


Last review by wippenNrippen78
* * * * *

Honda CRF150RB Expert 2015


Last review by remiles
* * * * -

Honda CRF150RB Expert 2017


No reviews available
Be the first to review this

Photo
- - - - -

Possible to put on a 21" wheel on a CRF150R fork?


  • Please sign in to reply

18 replies to this topic
  • Nigel Tufnel

    TT Member

35 posts
Location: Oregon

Posted March 06, 2008 - 01:40 PM


Anyone know if it is possible to put a standard 21" front on a CRF150R/CR85 fork? Enough clearance between bottom crown and top of wheel when the fork is fully compressed?

I am inquiring because of a frankinbike I am concieving.

  • trailrider9

    TT Bronze Member

114 posts
Location: Alabama

Posted March 06, 2008 - 01:46 PM


you might could if you slipped the forks down in the clamp so that the top of the fork is flush with the top of the upper triple clamp. and yes it is fine to do this because i did it on my 150rb along with tightening the sag on the rear spring to raise it up a little.

  • armourbl

    TT Addict

3,449 posts
Location: Arizona

Posted March 06, 2008 - 02:30 PM


I wouldn't recommend doing this. You are going to change the steering geometry of the bike drastically. Not to mention if the wheel bottoms out on the fender it will be the same as locking the front brake.

Why would you want to put a 21" wheel on anyways?

ben

  • Ghini

    TT Member

83 posts
Location: Connecticut

Posted March 06, 2008 - 02:32 PM


idk about your question, but i love frankenbikes, what do you have in mind?!

  • Nigel Tufnel

    TT Member

35 posts
Location: Oregon

Posted March 06, 2008 - 03:25 PM


Why would you want to put a 21" wheel on anyways?

ben


As I indicated in my original post, I am contemplating a frankinbike. I want to make an adult sized version of the CRF150R that weighs 160lbs.

  • armourbl

    TT Addict

3,449 posts
Location: Arizona

Posted March 06, 2008 - 03:28 PM


Probably would be cheaper to put the engine in a 125 frame. Especially if you found an older model you could pick up real cheap.

ben

  • yz440e

    TT Titanium Member

2,395 posts
Location: California

Posted March 06, 2008 - 07:31 PM


Well I think your biggest problem would come from the hubs. No one makes 21" spokes for a 150r hub, the front and rear axle diameters on big bikes are substantially larger than 150 axels. The only way I could see you doing it would be using a big bike hub and sleeving down the diameter to the correct diameter, then having custom wheel spacers machined. Also swing arm clearances could be a problem (if it did work with stock RB length swing arm, you would have no chain adjustment.) As far as clearances go with the fenders (assuming you want to do a 19" or 18" rear) I think that is the least of your worries, you can always do trimming and modifying to the body work to make it work...Post pics if you get it to work!

  • steepisgood

    TT Member

66 posts
Location: New York

Posted March 06, 2008 - 07:51 PM


I have the 18 drum rear and 21" front for sale from a 04 crf 230f, and I think the front fits...

any know for sure.

let me know,

edwin

  • 4strokeridertt

    TT Addict

3,741 posts
Location: California
Garage View Garage

Posted March 07, 2008 - 08:50 AM


Easy fits no problem. Reger Engineering makes the axle spacers and brake adapter for the CRF150RB or CR85RB. You will need a CRF230 front wheel complete and a CRF150F or 230F caliper to fit the rotor so you can stop. I don't have a clue on the rear.
The short wheel base may be a problem at higher speeds, you know a bit wild but not unridable.

  • oswa

    TT Newbie

13 posts
Location: California

Posted April 26, 2009 - 10:09 PM


Thanks for the Reger Engineering link!
Anybody know of a solution for the rear? I'd like to get an 18" rear wheel in.
I saw pictures of swing arm 'externders' but I have not been able to locate anybody that actually sells them, ideas?

Thanks

  • G31m

    TT Silver Member

680 posts
Location: Kansas

Posted April 27, 2009 - 06:11 AM


I want to make an adult sized version of the CRF150R that weighs 160lbs.

A noble goal, to be sure, but probably not doable.
By the time you add the bigger wheels and tires and a longer swingarm to accommodate the larger rear wheel, you'll be up beyond the advertised dry weight of 165+ pounds for the CRF150R.
What do you hope to accomplish with the 21/18 wheels/tires??
Changing the wheel diameters will not make the bike "adult-sized"...the chassis (seat-to-handlebar-to-footpegs) is still scaled for children.

The suggestion of putting the 150R engine in a 230 chassis makes the most sense....then spending another $4000 on lightening the bike to get it below 200lbs would acheive your goal, maybe? A full sized dirt bike weighing 160lbs? ....maybe a low speed trials bike with spindly frame and suspension components.

G31m

  • oswa

    TT Newbie

13 posts
Location: California

Posted April 27, 2009 - 02:38 PM


A noble goal, to be sure, but probably not doable.
By the time you add the bigger wheels and tires and a longer swingarm to accommodate the larger rear wheel, you'll be up beyond the advertised dry weight of 165+ pounds for the CRF150R.
What do you hope to accomplish with the 21/18 wheels/tires??
Changing the wheel diameters will not make the bike "adult-sized"...the chassis (seat-to-handlebar-to-footpegs) is still scaled for children.

The suggestion of putting the 150R engine in a 230 chassis makes the most sense....then spending another $4000 on lightening the bike to get it below 200lbs would acheive your goal, maybe?

Well, I didn't start the thread so I don't know what the original poster's intent was, but I'll explain mine.
I want to create a decently trail friendly, lightweight bike that my SO can ride.
She already rides the 150 quite well, but a full-size wheel combo would make it a better trail bike.
Modifying a 230 is not an option. That's what we started with.
It's heavier, lacks power and the suspension is quite useless.

Putting a 21/18 tire-combo on the 150 would as you pointed out not solve the rider ergonomics, but it will create a hybrid that will allow her to ride a bike with a good power to weight ratio and real suspension, without the weight and full-height of a 250.
We've done what we can with riding ergonomics already and while it's never going to be as good as a full size bike it's good enough for the time being.

  • G31m

    TT Silver Member

680 posts
Location: Kansas

Posted April 28, 2009 - 05:30 AM


Putting a 21/18 tire-combo on the 150 would as you pointed out not solve the rider ergonomics, but it will create a hybrid that will allow her to ride a bike with a good power to weight ratio and real suspension, without the weight and full-height of a 250..



The stock CRF150R has good power/weight ratio and real suspension as is. Not sure what going to larger wheels would do to improve that, nor will it improve rider ergonomics....so, what is the point...other than to add weight and height??
Not trying to rain on your parade, oswa, just trying to get inside your mind and find out what your train of thought is.....
I'd love to have a CRF150R that had footpegs an additional 4" back and down, with the same seat height, but it would take a different frame to achieve that...a frame that would have to give up ground clearance and quickness of handling.
Everything in life is a compromise, eh?

G31m

  • oswa

    TT Newbie

13 posts
Location: California

Posted April 28, 2009 - 07:45 AM


The stock CRF150R has good power/weight ratio and real suspension as is. Not sure what going to larger wheels would do to improve that, nor will it improve rider ergonomics....so, what is the point...other than to add weight and height??
Not trying to rain on your parade, oswa, just trying to get inside your mind and find out what your train of thought is.....

No problem.

It's largely a confidence thing.
I'm positive I can get the girlfriend on the 150r with 21/18 and get her to ride that bike in single track even if she doesn't flat-foot it.
She should be riding a full size 250, but she's not comfortable doing so for two main reasons: height and weight.
I'm trying to get as close to a 250 as I can without getting one.

As you know the 21/18 combo would do nothing for the power to weight ratio. I made that comment regarding comparing the 150r to a 230.
What the 21/18 wheel combination would give me is the ability to roll over bigger obstacles without 'problems' . It will also raise the ground clearance somewhat.
The smaller wheels of the 150r makes it harder to ride in choppy (think rocks and roots) terrain as the obstacles are larger, relative to the wheels than if it had a 21/18 combination.

I'd love to have a CRF150R that had footpegs an additional 4" back and down, with the same seat height, but it would take a different frame to achieve that...a frame that would have to give up ground clearance and quickness of handling.

You and me both! :banghead:
I regularly use the 150r as a playbike, but I can't ride it very long due to the ergos. Even with risers, taller bars, seat etc it's far from good for an adult around 5'11".
The engine and suspension in a slightly larger chassie would be one hell of an adult playbike/learner.

  • HappyG

    TT Silver Member

971 posts
Location: Hawaii
Garage View Garage

Posted May 24, 2016 - 11:35 PM


Don't know why I answered this.
But ive seen some great pictures of some with 21/18s

Edited by HappyG, May 24, 2016 - 11:42 PM.


  • davecampbell

    TT Bronze Member

369 posts
Location: Oklahoma

Posted September 13, 2016 - 02:24 PM


How much does the crf250 motor outweigh the crf150 motor? Could I put a crf150 motor into a crf259 chassis?



  • stevethe

    Get Help Now

5,245 posts
Location: California
Garage View Garage

Posted September 23, 2016 - 06:16 AM


Franken bikes kick ass. This is a aluminum BBR framed CRF230 motor with CR85 forks, swing arm and rear suspension. So forks flush to the top of triples for the 21" front. Note the rear swing arm extension to get a 18" on the rear. BBRwoods_zpse4e47e05.png



  • Munk

    TT Newbie

4 posts
Location: Oregon

Posted November 20, 2016 - 01:19 PM


Steve... I would love to know more about your 230.

What was the general price of componentry and what does the finished product weigh?

Did you use the CR 80/85 ergonomics and did lengthening the swing arm improve ride-ability?

 

The thing looks awesome. 



  • stevethe

    Get Help Now

5,245 posts
Location: California
Garage View Garage

Posted November 20, 2016 - 01:49 PM


Steve... I would love to know more about your 230.
What was the general price of componentry and what does the finished product weigh?
Did you use the CR 80/85 ergonomics and did lengthening the swing arm improve ride-ability?
 
The thing looks awesome.


Money wasn't the object. The original bike was bought used but they sold for big money new. It took a BBR perimeter aluminuim frame then a CR85 donner bike along with a CRF230 for the motor and wire harness. So it uses all CR85 wheels, swing arm, forks and so forth. It weighs over 200 lbs. The extended swing arm allowed for the 18" rear wheel. So the larger wheels made it handle better in the rough stuff.





Related Content

Reviews

Honda CRF150R 2017 by Chris.GVS


Honda CRF150R 2017
  • - - - - -
  • 0 reviews
Forums
Photo

I've been driving you guys crazy........but, by Dirtbiker227


Dirt Bike   General Dirt Bike Forums   What bike should I buy?
  • Hot  54 replies
Forums
Photo

Wanting to upgrade from my TTR 125 for CRF 150R Expert. by Guide


Dirt Bike   Make / Model Specific   Honda   CRF150 R/Expert
  • Hot  39 replies
Forums
Photo

valve adjustment 2007 crf150rb expert by steveallen77


Dirt Bike   Make / Model Specific   Honda   CRF150 R/Expert
  • 7 replies
Forums
Photo

crf150rb tp dead center by steveallen77


Dirt Bike   Make / Model Specific   Honda   CRF150 R/Expert
  • 3 replies

0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users

 
x

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.

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