That just looks SUPER unsafe for some reason....

thats what i'm wondering... just not sure if it would actually be safe or not

i mean, I get the concept... the extension bolt through the existing swinger... and you use your axle in the back of the "extensions."

But I would think there's quite a bit of stress on those bolts.... and a lot of flexing going on at the axle.

Looks to me like it would put a lot of pressure at the bolting point.

i was goin to say you could just weld it in there with the bolts, for extra strength, but then i realized it was aluminum, and the swing arm is steel.... what a ***** to weld

bolt-on? no f*ckin way would i use that....some dumass knob would use pretty stainless bolts instead of grade 8 or 10 bolts and end up an asphalt crayon real quick....I wouldn't sell those just for the liability reasons alone, that guy has bigger balls then me evidently...or hellacious insurance....

Okay, either there is alot of misunderstanding about the pressures and materials that sit under the stock Kat, or most of these comments were knee jerk reactions without thinking it fully through. (no offense meant.)

There would be hardly any pressure on the bolts at all actually. The insert section is smaller than the external piece. The large bolts through the axle holes are there just to preven them from pulling out the back. The step down stops it from pulling further into the swinger. All in all, there should be very little pressure of any kind to those bolts. This exact same concept is used by your bike already with significantly smaller plates on the end.

The size of those bolts are near the size of the axle you run.... and there are 2 of them per side! I'm gonna say... chance of that being a point of failure is higher on your stock bike.

You could run extensions like that without bolting them to the swinger at all if you trust your chain enough being as the only pressure really is pulling them into the swingarm.

The external part of the extensions looks well made, and pretty much of the same thickness, if not a tad thicker than most of the newer litter bikes factory swingarms. I would expect that portion of them is perfectly fine as well.

Over all, longer will allow for more flex of the swingarm. I do not see it being any different between that type of extension properly made VS. 6-8" more of the steel tubing.

Krey

very well said krey... so in your opinion... good buy or not?

Krey,
I am not a Mech E... but here is my thought process.

Aluminum tube, with a steel insert.
Steel insert held by two pressure points on the chain adjuster area... so it's already thin.
Moving the real wheel back, means that you've added rotational flex on each extension from the swing arm.
Hard bolts + hard insert on soft swingarm = torn swingarm.

You also aren't adding the welds that would give extra rigidity with a welded solution.

IMO this is fine if you are going to ride the bike down to the corner store for coffee and then home again, but for anything else you should consider just getting the correctly made long swinger.

Totally up to you. They will function just fine, same as welded on extensions. They have a few unique pros...

• Easy to install, no need to remove stock swingarm.
• No need for major modifications to the stock swingarm.
• Easily converted back to stock.

The only cons I can think of atm is asthetics. If the transition looks okay to you..

Cost wise your looking about the same as doing steel extensions for say a busa wheel, due to the size of the axle and need for custom adjusters to be made. If I did a 6-8" steel tube extension and made custom adjusters for the 32mm axle... your would be looking at right around $200-$250.

Krey

I get where you coming from, but some things are missing.

Only if you have movement. If the insert portion was significantly smaller than the inner tube, that would allow for alot of movement. That does not appear to be the case here. It looks to me that the inserts are long enough, that your using at least the last 5-6" of the steel swingarm as a sleave around the aluminum pieces. There won't be much movement without them bolted down. Once bolted in, there should be no movement at all. The amount of pressure that would need to be excerted to "shear" the steel of the swinger to cause a failure like that is insane. If that pressure was coming from a wheel mounted point, then there would be other points of failure first. Literlly, before you shear/pull those out... the entire swinger would fold up. I would bet that on a stess test.... the steel swinger would fail closer to the pivot point before the ends re-enforced with solid billet aluminum would.

The point one would weld an extension on isn't really going to add much regidity for flex... at all. I have seen a change on my swinger mod, but I'm positive that this is more due to the geometry change, than due to the weld alone. As with any extensions, if you have ALOT of power going to the rear wheel, then I would suspect one would use options that have flex support as well. No, these are not options one would use for a drag bike. Not because I feel they would fail any more so than simple extensions that were welded on... but because this option does not provide for that extra flex bracing.

I agree 100%. If your in need of an extended swingarm for purposes of drag racing with a significantly modified motor putting out alot of horsepower.... You should definately be using a fully re-enforced properly made extended swingarm.

How many street riden Katanas do you know that fit that bill though? (here is where suzukiray pops in pointing towards his garage... ) I would dare to say... Most people putting extensions on a Kat... are not for the drag strip.

Krey

Well I don't like and here is why:
#1 The flat tire on the Ram Pickup. Guy can make billet bike parts but cant fix a tire?
#2 $200 is a lot IMO for a hillbilly set up. An engineered solution would be to use a nut plate, when ever I see carriage bolts, I think swing sets..
#3 It isn't even fitted on the Kat in the picture.. I agree with Krey that the strength of material standpoint things are OK, but wiggly stuff happens, (Cause its a wiggly world). I like to know the guy hawking the kit has had it fully installed and tested (IE driven a few hundred miles) on it. This guy doesn't even have a chain on that bike..

Ew bolt on extensions...a lot of the Ninja guys use them, just another way to do something on a budget instead of the right way.

I think it's fine. I do wish it extended up inside the swingarm a bit more (haven't looked to see if that is possible, but it would make me more comfortable if it did). There are many swingarm extensions for SS bikes that are a lot more scary looking than these.

Agreed..... the hardware used doesn't inspire much confidence.....

Lol, I wouldn't buy anything from an ebay auction that uses the phrase "pimp your ride"