More GSXR 17" rear wheel swap questions.

[DB Cooper]

Just wondering if you have done this swap, what size sprocket (tooth count) did you change to, if you did change? Going to a larger diameter rim and tire (going to put on a 170/60) would mean increasing the tooth count to compensate, but I'm just curious as to how much.
Thanks
Kevin

[andyb]

Untrue.

A 170/60-17 is nominally 636mm tall.
A 150/80-16 is nominally 672mm tall.

The 170 is about equal to adding a tooth to the back sprocket as compared to stock.

Honestly, 17/40 with the 170 is a good setup.  Go 18/40 if you want a little more relaxed crusing revs, and go the other way depending on how twitchy you want the power. 

Read up a bit.

[fj11.5]

when i get it fitted ill have a 170 ,will need a smaller rear sprocket as the one fitted to the rim is 46 teeth ,not extending my chain to fit, can get a 41 t from the states, smaller ones are 38 t ect but the price is too high for me atm ,,oh ps arnie ill send the rear end of the gsxr parts today

[DB Cooper]

Hey Andy.
I didn't realize that the 150/80 was that much taller. I'll stick with the 40 tooth.
Thanks
Kevin

[SlowOldGuy]

A 170/60-17 is nominally 636mm tall.
A 150/80-16 is nominally 672mm tall.

Andy, you put both tires on the same 17" rim.

My math shows the following for overall wheel/tire diameter:

170/60-17 = 636 mm
150/80-16 = 646 mm

The drive "gearing" is a function of the ratio of the radius/diameter/circumference between the two combos.  

The actual ride height is only half the difference in diameter (which is the difference in the radius), or 5 mm.

DavidR.

[billwest]

I went with the 18-tooth Yamaha front sprocket, and a 40-tooth Suszuki sprocket on the rear.  The rear is off a GSXR750 model, as it matches the 530 chain.  The sprocket from the GSXR100 does not suit.
All that with a Michelin PR2 170 x 60 x 17 tyre.

Bill.

[DB Cooper]

I just found this info on the Dunlop site.
A GT501        150/80B16 has an OD of 25.25 inches (641 mm)
A Roadsmart   170/60R17 has an OD of 24.99 inches (635 mm).
I know these tires aren't the same model and some variance between brands is to be expected, but this is overall close enough for me to just stick with the gearing I have.
Thanks
Kevin

[andyb]

Andy, you put both tires on the same 17" rim.

My math shows the following for overall wheel/tire diameter:

170/60-17 = 636 mm
150/80-16 = 646 mm

Fooey, you caught me.  I was right in saying that the 170 is shorter, at least, that much I remembered.  Too tired this morning, I suspect!  Good catch, David.  I was trying to be a nice person and not just link to the search function, because I know someplace we went over this with a lot of completeness.  Nertz!

I think technically you use the circumference, but seeing as you'd plug everything into the same formula, they'll remain proportionate when you do the math for comparisons.

Still say that 17/40 is a lovely compromise gearing, does everything pretty well.  Front wheel is repsonsible for the speedo, so no worries about throwing your gauge more off.

[SlowOldGuy]

I kept the 18/42 combo on my '85 with the YZF600 rear.  Approx equal to the 17/40.

DavidR.

[fj11.5]

Anybody have a brake tourque? Arm for Android 88/89 gsxr they would swap for a 92 model arm as the bloody thing Shane different ends Android too short

[gripit_N_ripit]

GSXR rear wheel swap is coming right along, but i need to find the wheel spacers and rotor bolts. I call the motorcycle graveyard (junkyard) and they said they have a WHOLE BIN of wheel spacers. I'm gonna try my luck with them but I lack the exact measurements of the spacers. Does anyone here happen to have this info?? It's a 92 GSXR750 rear wheel.

[DB Cooper]

I am just about finished getting all the parts for my swap, and I had to source the spacers as well. A lot of the parts are interchangable from other Suzuki models, my spacers came from a 1200 Bandit, with an axle for 28.00 including shipping. Go to this site,  http://www.suzukipartshouse.com/suzuki-parts.aspx?aribrand=SUZ. Find the rear wheel parts fische for a 1992 GSXR 750. Look at the diagram, find the spacers you need then cross refference to the parts list, then type that number into google. A couple of parts suppliers will come up with what other models use the same part numbers. Head over to Ebay and see whats available. 
Kevin

[gripit_N_ripit]

Thanks for that info Kevin. I would like to use the company I'm in contact with only because they are local. Is there any way possible that you could take some measurements for me?? According to the parts fishe they are spacers #7 and #12.

[DB Cooper]

I'll get some measurements and pictures and send them later this evening.
Kevin

[DB Cooper]

Here goes.
Number 12 in the parts view is pretty well straight forward
16.5mm thick X 35mm OD X 20 mm ID.

Number 7 is a different ball of wax.
I would reccomend trying to source this piece if possible.

The part that goes against the wheel is 45.5mm
The part that goes against the caliper stay is 39.9mm
It is 21mm thick
20mm ID



First pic is number 12, second pic is number 7