Speedo is WAY OFF!
- Thread starter CHADAWAY
- Start date
Gear Ratio / Tire Size Table | Interco Tire
This table shows the numeric change when you change your tire size.
www.intercotire.com
Something like this may get you closer.
Isn’t that just a bandaid? There has to be a reason the Speedo is off to that degree.
I have no clue what the gearing is. Bought it December 7th and rode it 3 times because I’ve been doing some changes and maintenance on it. I’ve got the RokForm stem mount, I’ll use the app on my ride later today and see what it says.
How do I check the gearing?
It’s a SPR520-47T sprocket on the rear. The sprockets between the transmission and rear sprocket are both 18 tooth. No clue what the sprocket is on the transmission. The tire is a 300/35R18, not sure what factory is supposed to be.
The tire is a 300/35R18, not sure what factory is supposed to be.
Thanks! I love it! Makes it even better is the hell of a deal I got on it!
OEM wheels and tires should be a 190/50/17 rear and a 120/70/17 on the front. Some go with a 200 rear with no issues. Some also go with a 55 series tire. OEM sprockets should be 17/40. I have no idea how much your 300/18 rear and the difference in sprockets affects your Speedo. Maybe by 25 mph?
This is what they look like stock. Mine has over 80,000 Smiles on it.
This is what they look like stock. Mine has over 80,000 Smiles on it.
That 47 rear sprocket is the biggest reason it’s off. Probably to turn that heavy tire combo u got back there lol
If it has a jackshaft, those sprockets are probably the same size and don’t factor. The front sprocket behind the clutch slave master is the one u want to check.
Speedo healer is all u need.
If it has a jackshaft, those sprockets are probably the same size and don’t factor. The front sprocket behind the clutch slave master is the one u want to check.
Speedo healer is all u need.
For informational purposes, Looking at a gearing and tire calc, Your rear tire is about two inches taller than stock.
I wouldn’t be surprised if they put a 16t front sprocket along with that 47 rear to make sure it still had some good pep in its step with all the extra weight from the wheels and tires, swingarm, etc.
I wouldn’t be surprised if they put a 16t front sprocket along with that 47 rear to make sure it still had some good pep in its step with all the extra weight from the wheels and tires, swingarm, etc.
No, the Speedohealer corrects the speedometer within +1/-1 mph when compared to gps.
It lets you change tire and sprocket sizes and be able to make the speedometer accurate again.
There is a chart on their website for the bike, tire sizes, and sprocket sizes, which gives you a number to enter into the Speedohealer.
I had one on my Gen2, and have one on my '03 Gsxr1k.
I mounted mine under the guages on the 1k for easy access.
I have 2 different front sprocket sizes(16 and 17) and 3 different rear tire sizes for that bike, 190/50/17, 190/55/17, and a 200/55/17.
I havn't decided which ones I want to use and stay with yet.
I rode with my group today and confirmed at 80mph my speedo reads 100-105 so I definitely need a change. The rear sprocket isn’t in bad shape but it’s not great so I’ve been thinking about replacing it, just not sure if I should go back with 47 tooth or something different. It for sure has plenty of pep! If I get on it hard from 1st to 3rd it likes to spin A LOT. I also noticed when I was on the highway in 6th it sounds as if it’s wanting another gear, like I’m at the top of 4th or 5th and staying there. My club (a bunch of veterans on Harley’s) was riding between 60 and 80 and sometimes it seemed like it was wanting more. Not sure if that’s normal or if there’s something I need to change.
How do I access the front sprocket? I can’t see it so I’m assuming it’s behind a bunch of stuff.
Mythos
Registered
I've run 190 and 200 on my Gen2 and that seems to just about correct the stock speedo which reads high with the smaller stock tire. ...so maybe there is more to it than the 300 tire. If anything, a larger tire should make the speedo read slower. +25 mph at an actual 80 does seem like a lot even with a stock tire. A Speedohealer will take care of it but I'd want to find out what's causing such a large discrepancy. If the rear sprocket is stock size, I'd almost bet the front isn't.
You have a clutch slave cylinder and a sprocket cover to remove. Proceed with caution, the clutch slave might need some extra preocedures to prevent it from popping out while removed from the pushrod. ...also, torquing the clutch slave bolts, lots of sprocket covers have cracked so be careful. I believe it's just one bolt that's the culprit. I wish I had a tutorial thread I could point you to. I started a sprocket cover tutorial years back but never got around to finishing and posting it yet. I found plenty of info on sprocket cover removal on here though so take your time and ask questions. OH--aligning the sprocket cover to the dowel pins is another thing I remember requiring extra care. I wouldn't expect this to be a one day job if you've never done it. LOL if you search, you'll probably come across threads I asked questions on.
OldBusaGuy
Registered
I compared my speedo to GPS on my 04, and it is about 10% off. This is with stock sprocket sizes and tire sizes. It boggles my mind that in 2004, Suzuki couldn't do better than that. My 97 Harley is right on, no matter what speed I'm running. I may go the speedo healer route, just because.
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