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Fasst Company Anti-Vibration Inserts - Standard 7/8"

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Have it by April 21st when you order by 3:00pm PST.
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Product Description

  • High-quality brass inserts with elastomeric expansion joints mounted inside the handlebar.
  • For use with all aluminum handlebars except Renthal Twinwall bars.
  • Reduced vibrations felt through the handlebars, which means less fatigue and numbness in arms and hands.
  • Injection-molded plastic endcap along with adapters will fit most counter-bored or countersunk mounted hand guards.
  • Customer Reviews
  • Ask an Expert
3.4 out of 5 stars
5 star   2
4 star   2
3 star   1
2 star   1
1 star   1
raptorscott Location: Phila ,Pa
1-7 of 7
Verified Purchaser
Didn't fit with MSR handguards

I couldn't get these to fit with my MSR/Enduro Engineering style handguards. They were well made and sturdy. The small o-ring fit in my stock KTM bars - the end mounts just wouldn't work with the guards.

Verified Purchaser
Location: Pittsburgh pa

Save your money for anti vibe stem cannot tell difference

Location: Redmond, OR
Anti Vibe

I first started using these inserts five years ago on my 96' YZ 250 with Renthal CR Low 7/8 bars and I continue to use this product on my 07' KX250F I havent had arm pump since I first purchased them back in 2006! Amazing product!

Location: Folsom, Ca.

It only takes about 50% of the vibration, but it does halp.

Location: Phila ,Pa
It works

A great additon to my fat bar. They make a difference. I'm not sure what it is the handle bar, anti vib inserts or the few tums I take every time I go out but by hands feel much better and no more arm pump.

Top 50 Contributor
Location: cedar creek, tx

They do help reduce vibration some but they are easy to install but make sure you have new grips to install after wards.

Location: Minnesota
Great Product Support

FASST makes great stuff and great product support. I am confident these inserts will help for anyone riding a 2 -stroke that gets arm pump. The only problem is if you cut your bars down (mine are 30") the insetrs will not fit. I ended up cutting a couple inches off th ends of the inserts to get them to fit far enough into my bars so that I could install my bark busters. The other option is to get them machined so the diameter can be made smaller so that you can shove them further into your bars. If you don't use bark busters you may be o.k. In any case I almost had to cut each one in half to get them to fit which seemed like a waste but they seemed to have helped a great deal. They are very well made parts and I hope some day to be able to afford their Flex bars as well.

1-7 of 7
Total Questions (8)
Questions with answers:
Questions without answers:
1-8 of 8
zachy 3 months 27 days ago Location: Northborough, MA, USA
Will these fit the metal m bar?s?
MotoSport Staff Expert
3 months 27 days ago
These are specifically made for the Renthal Twinwall Handlebars. According to Fasst Company's application chart the Standard 7/8" Inserts will actually work with Pro Taper 1-1/8" bars like the Metal Mulisha Bars. I would recommend checking the Inner Diameter of the hole in the end of your handlebars just to be certain. Fasst company notes that the bars must have 13.5mm I.D.
River Over 3 years ago
How do i install these?
MotoSport Staff
Over 3 years ago Location: P+RTLAND
Just put the insert into your bars with the allen head facing out then tighten it down. The grommet on the inside will expand locking it into place.
LanceYZ250 Over 4 years ago
I have renthall twinwall bars with a Tusk bearing throttle tube.... will these still fit under my throttle tube??
MotoSport Staff Expert
Over 3 years ago Location: Portland
These will fit inside any Twinwall handlebars. Your throttle tube must have a removable end cap for these to work with it.
Over 4 years ago
Will this fit all handle bars except the renthal twin walls?
MotoSport Staff
Over 4 years ago Location: P+RTLAND
From what I know these don't fit the Twin Walls or the O'NEAL Double Walls
bananaman755 Over 4 years ago Location: olney, md
What are they?
what do these do? do they help you with the stiffness in your hands after riding?
MotoSport Staff Expert
Over 4 years ago Location: Portland, OR
These are inserts for your handlebars that help absorb vibrations. What that means is they help with arm pump.
Top 1000 Contributor
Over 4 years ago
The Anti-Vibration bar inserts helps eliminate the vibration and abuse sent to your hands, arms and wrists while riding. They were given a 10 out of 10 in the product test in Transworld Motocross Magazine.
ndh526 Over 5 years ago
Do they fit the renthal twinwall?
MotoSport Staff
Over 4 years ago Location: P+RTLAND
No, these ones do not fit the twin walls. You would need to order the ones specifically for the twin walls. Here is the link:
Top 500 Contributor
chris818 Over 5 years ago Location: Granada Hills, CA
Will these fit the Pro Taper Contour Bars?
Expert MotoSport Staff
Over 5 years ago
Yes, these bar inserts should work just fine with your Contour bars!
corn Over 5 years ago
Do these work for any 1 1/8 bar or just renthal fatbars??
MotoSport Staff
Over 5 years ago Location: Portland, OR
It's kind of strange. Basically the standard size inserts are for the fallow applications: Renthals 7/8th bars, the Fat bars, and all pro tapers.. The twin wall inserts only work with the twin walls and the O'neal double cross bars. So if you have fat bars you want to go with the standard anti-vibe inserts.
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What It Is

Fasst Company Anti-Vibration Bar Inserts are small weights that you insert inside the ends of your handlebars to help kill the vibration transferred to your hands through the grips.


With models to fit every style of handlebar available, Fasst Company's bar inserts are a breeze to install. The difference is easy to detect from the moment you fire up your motorcycle, as the buzz transferred through the handlebars is drastically reduced. For riders who are not very sensitive to changes made to their bikes, Fasst Company suggests installing one side at a time, with a ride in between to detect the difference in feel. With years of experience using the inserts, we need no convincing of their benefits.


The inserts add approximately 1/8" to each side of your handlebars. Super-sensitive riders might want to trim their handlebars to compensate for the added width.

The Verdict

Fasst Company Anti-Vibration Bar Inserts are not new, but they are a staple when it comes to making your bike more comfortable and easier to ride hard throughout an entire moto. You can't see them, but you can definitely feel them!

Be Informed

Be Confident

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