No idea, but the 13-16 Daytona also has a different engine than the Street 675 -- shorter stroke is the key difference. I take it they redesigned the entire bike including chassis. Just in time for the middle weight sport bike market to collapse.

 

You need to look at the parts fiche as there is a spacer/bushing for the Daytona arm that is different than the Street part. Also, different rear fender/hugger. Other than that, its a direct swap. Bike frame is the same bike to bike, subframe is the same minus the Daytona having additional holes drilled for the rear plastics.

The Street arm is longer. Maybe to increase wheelbase and not be twitchy like the Daytona? IMO it seems like a hassle to have two different swingarms on a bike with a similar motor.

It definitely looks better with the Daytona arm

 

It comes down to rider position and performance geometry.

I don't want this to read/sound like BS but ...

If you look at the Daytona, it's ergonomic profile (rider position, handlebars, posture, peg location, ENGINE location) and it's intended use, there are enough differences to know that plenty will need to be changed for the STR to be what it's intended to be.

So, gyroscopic balance in relation to where the rider is seated is bettered with the wheel further back. This stops the front end from being "upset" while throttling up mid-lean during a tight curve. The short of it is, based on the rider's posture/ergos weighed against the power of the engine, this insures that our bikes are more forgiving while giving us "all we ask when/where we ask for it".

Though yeah, a shorter wheel base will put your butt over the tire for easier wheelies if that's what you're after.

Jokingly snide (nothing personal): I'm sure the riders who lap you multiple times mid-curve at a track day will be greatly impressed by your constant/unending victory wheelies

 

Lol at the last part.

But the Daytona and Street share the same chassis and engine positioning. My bike also has the same seat and rearsets as a Daytona - the only thing is the handlebars that keep it a bit more upright. I did the swingarm mod for pure aesthetic reasons at first but after riding it hard, it definitely makes the bike more flickable and tracks better through corners - shorter length definitely does that.

You can come on down to Barber, Tally or RA sometime and test your "lapping theory"

 

You can come on down to Barber, Tally or RA sometime and test your lapping theory

LOL! Not a chance ... I'm barely in the middle of the pack with the intermediate hooligans. My only visual offering, on an '88 Honda Hawk GT with a bone stock suspension. Oh man ... I felt slow. SA-LOOOW hahaha:

Did you say your bike has rearsets but with the stock bars?

 

Haha okay. And yes Daytona rearsets with Renthal bars - lower and less sweep than the stockers. I've thought about clip-ons, but after riding a LOT of different 600/1000 sportbikes, I definitely felt like my bike was the happy medium. Sporty without being a pain while commuting or longer rides.

 

The ST is made for stability hence the longer swing arm which btw alter the suspension set up as you may have found. Its a longer leverage point so now that you have gone shorter your suspension will not have the same leverage and will be a lot stiffer. So I would suggest setting your static and rider sags and you will probably find you need a much lighter spring to achieve both settings. Drop me a PM if you need a guide on how to set suspension. The engine in the ST is the old 2012 Daytona engine with cast pistons (not forged) and softer cams, giving more mid-range and slightly less top end and a lower rpm limit.

 

Thanks I may do that. I have the front forks resprung and revalved (before the swingarm replacement) and I'm running the stock rear shock spring rate and valving. other than that, I've got a set of 2009 Daytona cams that are going into the engine soon.

 

Did this swap. To answer my own question, the longer swingarm is absolutely to detune the street.
It turns and rides so much better without any changes to shock or fork set up. It doesn't fall into corners anymore, it tracks and rides beautifully.

Think about it..

Why would you make the street, a bike marketed as a nimble street bike have a longer wheelbase? A longer wheelbase is for high speed stability at the expense of manuverabilty.

It makes no sense unless you want to make sure it doesn't outshine the flagship, the Daytona.
The same as the different cams. I just installed 06 Daytona cams. "Tuned for midrange" my ass. It's detuned, end of story.

More power everywhere

Thanks to apacifico for help with the swingarm swap

 

Probably a silly question but since the swap do you think it was worth the effort?
I'm looking at doing the same mod but parts are a little pricey here in Thailand.
Even though the factory is here parts are shipped out and then imported back at higher prices.

Did the swap change the ride height in anyway?

Just want to get a better idea if this is a worth while mod.