AC Racing Subframe
AC Racing Subframe

$295.77 $448.99
34% Off - Save $153.22

Description See Also: 36 Reviews 9 Questions Fitment Part Numbers
Item #ACG000G

Read More
36 Reviews
3.3 out of 5 stars
5 Star   12 4 Star   7 3 Star   3 2 Star   7 1 Star   7
Write a Review

Write your review and you'll automatically be entered in our monthly drawing. Include an image or video to DOUBLE your chances to win!

Write Your Review Write a review to win $500
All Reviews
Verified Purchaser
Not a lot of other choices for subframes...

There are not a lot of other choices for subframes... So I was kinda stuck AC Racing... but it has turned out to be a great find. Installed with very little frustration and re aligned my bike perfectly! I cannot attest to the strength, but so far so good! If you need a subframe, this it the one you should get!

AC Racing Subframe
Verified Purchaser
2015 kx450

Almost exact fit feels much stronger the Oem . I'd say save 200$ and buy this subframe you won't be disappointed!!!

Verified Purchaser
Doesn't fit bike

The product came and looked like it was bent, but I tried to put it on my bike anyway. There was no way to make it fit without bending it, so I decided to return it and buy the OEM part. Motosport made me pay the return shipping myself because I couldn't exchange it for the OEM yet, due to it being more expensive. Bad experience with both AC Racing and Motosport.

Top 1000 Contributor Verified Purchaser
2014 kx250f

All the bolt holes and air box lined up. I've had it on my bike for 6 months and I haven't had any problems.

Top 1000 Contributor Verified Purchaser
Pearblossom, CA, USA
Good replacement sub frame

So far this frame seems as durable as OEM. Bolted right on and no issues with any plastics, seat, or muffler. so far I'm glad i bought this frame. it saved me a bunch of money after a bad crash broke the OEM frame.

Edgewood, NM
2013 RMZ450 junk sub frame.

I bought this subframe too save money from OEM. Do not make the same mistake as I did. The fit was terrible, the quality looks like it was made at a middle school shop class from scrap metal out of a dumpster and after 6 rides the welds had broken in two places. I contacted AC Racing and notified them. Their response was for me to pay for it too be shipped and welded. Save your money and go OEM.

Good price for a subframe and fits pretty easily BUT the mounts dont hold up well at all and it bends way too easily! I layed the bike over ever so slightly and it bent! The exhaust mount stripped the threads the first time we remounted the exhaust and the thing didnt hold up well at all! Wouldn't buy it again. Pay more for a good OEM!!

ostrander, oh
04 Kx125

mine fit perfect but it bent after 3 races and the top bolt thread stripped out and silencer hole had to be re taped... but hard to beat the price!

San Jo, CA

The good:
Weighs exactly the same as stock about 2.2 lb. Very nice welds, n machining! All steel thread inserts, except muffler mount. Looks great, especially at about half price of OEM.

The not so good:
Requires minor tweaking to fit initally. Noticeably weaker than stock! Was my fault, but dropped bike loading it after first ride n bent it... classic example of 'ya get what ya pay for'!!!!

Top 1000 Contributor
galien, MI
Its gets the job done but....

the ac subframe wieghs way more than my stock '05 crf 250f subframe. its bulky. and no where near the quality of the stock one. the bolt holes dnt line up and the casting holding one if the nuts in broke and i had 2 jb weld it. it gets the job done but is no where near the quality of stock...

Beaumont, Texas
AC Racing Subframe

I just bolted the subframe onto an 06 honda 450. It was a great fit. No more than a simple flex of the tubing and all the bolt holes lined up great. The frame seems plenty ridged without being brittle.We will run the bike tommrrow at Rio. Let you know how it rides after tommrrow.Only thing I can say is I didn't get any AC Racing decals for our trailer

Top 1000 Contributor
Grand Rapids, MI
Fit my bike pretty good

This fit my 2004 CRF250R quite well. Took a little bit of work (pulling) to get the left side lower bolt to go into the frame, but overall, I am pleased.
Haven't crashed (again) with this new sub-frame, so I cannot comment on it's durability.

elma. ny
Fits like a glove.

i bought this for my 01 kx 250. had to tap it into place wit a hammer but other than that a perfect fit.

Best bag for your buck.

I had bent my sub, and did some shopping around. By far this is a great deal. Everything
lined up pretty close. 1st time putting it on had to work it a little, now comes on and off no problems. If you run into this problem save yourself 200-300 dollars and pick this up. Can't belive how much they wanted for the OEM.

Don't believe the Hype

I've read many articles about this thing before I purchased it. Motosport was awesome with getting it to me right away, but when I got it the mount that holds the Gas Tank was broken off. About 3-4 rides in I took a small crash on a track in a turn that was over watered, when I got back up it was bent. I wasn't even going very fast maybe 30-35. The threads strip out too easy, they didn't plan ahead and put steal threads in like the stock one, so I did myself. After using this thing for a couple of months I ended up going back to the stock one because it's much better made. Like the title says, Don't Believe they Hype. These things are Junk.

Top 1000 Contributor

Purchased this for a friends 01 RM-250,all the holes lined up perfectly,not one install problem,all the plastic lined up good,and it was about $200.00 less than a OEM part,now his rear fender is nice and straight....

Testing out the AC subframe
Fly'N on the RM
Kalamazoo, MI
Not a Big fan

Every thread stripped, fits fine on my 2006 yamaha 450, but i guess you get what you pay for!!

2005 KX 250F

This went on my 2005 KX 250F very easily. The muffler, airbox and side panels all lined up perfect. Haven't ridden yet, but the construction seems as good as the oem.

Bossier City, LA
It's Not OEM

Tight fit, required serious elbow grease to line up with frame. Next step would be grinding.......

What can I expect, it's not Honda...

parker, co
It was ok

I bought this product becuase it was cheaper than the oem by 200 dollars. AND NOW I SEE WHY!!!! it was a tight fit and then when i got it on and took it out for a ride it worked fine but about the 5th ride out i came over a table top landed fine but THIS FRAME had cracked in two. Therefor cancelling my session and forcing me to by another

See 16 More Reviews
9 Questions
Answered:   9
Not Yet:   0
Location: Cape Town, South Africa
Q: Are the 2009 yz450f and yz250f sun frames interchangeable? Looking for a subframe for a yz250f?
2 years 1 month ago
Expert MotoSport Staff
2 years 1 month ago
A: Yes. It would be the same AC Racing Subframe for the 2006-2009 Yamaha YZ250F and YZ450F.
Q: Is this frame good quality and worth my money? Do you have if for a 2007 KX250F? And would an FMF Powercore 4 fit this subframe?
2 years 11 months ago
MotoSport Staff Expert
2 years 11 months ago
A: Yes the AC subrame is good quality and far less price than the stock OEM. The AC Racing Subframe is built to OEM specs, you will have no problems mounting an FMF powercore.
Location: france
Q: Confirmation?
Over 4 years ago
hello,befor my order I just wanted to have confirmation, the ac racing i selecting, is the good piece for MOTO cross 450 YZF thanks a lot I'm in France, Alex
MotoSport Staff
Over 4 years ago Location: Portland, OR, USA
A: We do have this subframe available for your 2012 YZ450f. Just make sure to profile your bike correctly when ordering so you receive the correct item specific to your bike.
Location: Utah
Q: Quality?
Over 4 years ago
We have read several bad reviews on this and my son races and has a lot of crashes. How does this subframe compare to the stock ones. I don't want to waste my money.
MotoSport Staff
Over 4 years ago Location: Portland, OR, USA
A: The AC subframes are designed to be OEM replacements. AC makes a lot of quality aluminum products and you should have no issues. If for any reason you run into any problems, please contact our customer service and we will get you taken care of.
Top 1000 Contributor
Over 4 years ago Location: Pearblossom, CA, USA
A: I purchased this sub frame for my son's 2013kx250f after he crashed and destroyed the sub frame and literally turned the slip on section of the pipe into a Z. The AC Racing sub frame was a perfect fit for his bike. And there are sections that I thought were stronger than OEM. I am very happy so far that I purchased the AC Racing sub frame,
Q: Is this frame ment for dual slip ons or a single, and will a FMF Ti4 slip on fit?
Over 4 years ago
MotoSport Staff
Over 4 years ago Location: Portland, OR, USA
A: This is an OEM replacement subframe. It is designed to replace the stock subframe and accept the same exhausts the stock subframe would. This will not be dual exhaust compatible as the 2009 CRF250r did not come with, and was not designed to use dual exhaust. Any exhaust designed to fit the 2009 CRF250r will work this subframe, including FMF.
Q: 09 250r?
Over 7 years ago
will this fit a 2009 CRF250R?
MotoSport Staff Expert
Over 7 years ago
A: it does i just dont have one for your bike right now. but i will be soon
Q: Thread?
Over 8 years ago
Does it have thread the for the screws in the holes to screw the screws in?
MotoSport Staff Expert
Over 8 years ago Location: Portland, OR
A: this is a bolt on replacement OEM type subframe with all of the holes predrilled and threaded.
Top 1000 Contributor
Over 7 years ago Location: Grand Rapids, MI
A: Yes, all necessary threaded holes are there.
Top 1000 Contributor
Over 4 years ago Location: Pearblossom, CA, USA
A: The AC Racing sub frame that I purchased was exactly the same as the OEM frame, threaded or not threaded as needed.
Q: Question?
Over 9 years ago
i have a 04crf250r and want to put dual exhaust on it. can i buy the 06 subframe and numberplates and make that work for my bike?
MotoSport Staff
Over 9 years ago Location: Portland, OR
A: They changed a lot of things from 04-06. The air box is different, the side panels, and the sub frame are all different so I wouldn't recommend trying it. It will probably turn out to be more work than it's worth.
Location: citrus heights
Q: Installing?
Over 9 years ago
does this come with the screws or do you have use all the screws from the stock subframe??
MotoSport Staff Expert
Over 9 years ago
A: This will not include any hardware, you must have your stock bolts to mount.
Top 1000 Contributor
Over 7 years ago Location: Grand Rapids, MI
A: No fasteners included. You will need to re-use the existing bolts.
1-9 of 9
See all bikes that this part fits...
See Fitments
# Part Numbers
Product Variant Manufacturer Part #
AC Racing Subframe 02-4756
Report an Error