Good evening, I've recently bought a 2011 Repsol Cbr1000rr abs. I've wanted one for year and I'm very pleased with it. However I was told by the lad I bought it off the previous owner had gone one down on the front sprocket. I haven't had a look at the fitted front yet so I'm taking his word for it, but am I right in thinking stock would be 16 front 42 rear? The current rear is a 44 so I imagine he has gone 1 down front and 2 up rear. I used a GPS watch and the speedo registers 35mph when actual is 30mph, and 70mph when actual is 60mph. (I know watches lag but it was best I could do at the time). Question is am I better off buying a speedohealer or just buying a standard sprocket and chain set. Speedohealer is about £85, new chain and sprocket £185 ish. Thank you for any replies.
Hi and welcome to the forum - how long have the chain and sprockets been on? Got to think to yourself are you happy to stay with that gearing, or would you rather be back to standard when they need changing. If your planning on keeping as is then speedo healer is best. If you plan to go standard I’d leave as is
Bikes done 7k miles and previous owner only did 1k off that. So I imagine 2-3k they've done. They're immaculate with no signs of wear. I'm happy keeping it until they wear but my concern was will it cause any extra stress on mechanical parts.
Plenty on here have done similar sprocket changes without any issues I recall, but this is where someone steps in and says you need to upgrade the flangees
I'll leave it for now and see how it goes with a speedohealer. I do less than 1000 miles a year as I work away a lot so the current set up should be OK for now. I have no idea about the flangess or where they are so I imagine that wont be done
Hello and welcome to the forum Johno. I'd leave as is and get a speed healer. As the chain and sprocket are all good it's the cheaper option than a new set of C&S. Chin
Hello and welcome Johno ,,,,, what is the rear tyre profile size 50 or 55 ,,,,,, that will make a difference as well
There are no flangees (when I looked I got the spelling wrong) but don’t worry - that was a friends joke.......
I had similar set up on a 600RR. Got clocked by a camera van at 75 in a 60 and got away with it has it was reading higher than i was doing.. Always nice to have a comfort blanket
Get the speedohealer, it's a no brainer. You can do what you like then with sprockets/tyres in the future and you'll always be able to true up the speedo. I've just fitted one to my bike and it's very simple, aslong as you are capable of lifting the tank. When you look at the healtech calibration calculator your speedo over reads by 5.2% from the factory as standard. Your changed gearing causes another 10% over read giving you a total of 15.2% over read. This makes your GPS watch test results extremely accurate. If you changed the rear tyre to a 55 (quite a common change) this will make your speedo slightly more accurate (12.6% over read).
Thank you I'll keep an eye out for one on ebay, I can't use it yet and I'm off to work for 2 months soon. If I don't get one I'll buy a new one before I head home and fit it. Quick question regarding tyres what difference would a 55 over a 50 make. The tyres I have on have loads of life left so I would use them first anyway. I've always used Bridgestone batylax on my bikes this has Michelin pilot 4s on and they seems slippy.
The 50 has a 'flatter' profile so you have more contact patch with the bike upright. The 55 gives you more contact patch when leant over.
Just be careful if you have an aftermarket rear hugger, a 55 profile tyre can run very close to the hugger, you may need to pack the hugger out a bit with washers etc.
