Gearing Up 2015 F800R - BMW F800 Riders Forum & Registry



Remove this advertisement by REGISTERING.

Results 1 to 8 of 8
  1. #1
    padaek's Avatar
    Points: 1,970, Level: 27

    Real Name
    Jurgen
    Location
    Shellharbour Australia
    Joined
    Nov 2016
    Online
    24 Minutes Ago
    Posts
    261 / 0 / 0 / 0
    Motorcycle
    '02 Sprint RS
    Motorcycle
    '90 Le Mans
    Motorcycle
    '15 F800R
    I'm beginning to realise what a fabulous open road bike the F800R is, especially after fitting a MRA screen. Brilliant fuel range, predictable handling and generally comfortable for longer trips. I've also bought some soft luggage ready for touring.

    I've always enjoyed long legged bikes, coming off a couple of Moto Guzzi Le Mans, which have tall first and top gears. On the open road they just lope along running off the bike's torque. My Le Mans Mk V was geared at 30 kph for every 1000 rpm in top (5th) gear. In short, 4000 rpm sees 120 kph (via Veglia), 5000 rpm sees 150 kph. When maximum torque comes in at 6000 rpm you are being rocketed along at 180 kph. At that speed the Le Mans could burst through brick walls.

    Now,, I'm toying with the idea of gearing up my F800R. The standard counter sprocket has 19 teeth (I think). First and second gears are already quite short compared to the pre 2015 models. So gearing up a bit shouldn't effect getting off the mark too much.

    How would a 21 tooth counter sprocket go? Has anyone geared up their F800R?
    padaek - A putrid and fetid smelling fermented fish sauce from Laos. 

  2. Remove Advertisements
    F800Riders.org
    Advertisements
     

  3. #2
    Number8's Avatar
    Points: 2,182, Level: 29

    Real Name
    Hampshire
    Location
    S. Hampshire UK
    Joined
    Dec 2015
    Online
    04-26-17
    Posts
    361 / 0 / 0 / 0
    @Jurgen, the BMW F800GT is reading 70 mph, 113 Km/hour at 4,000 rpm, it would be good if that machine was higher geared, but then 6th gear would be an overdrive with not much performance until 6,000 rpm was reached. Not the best.

  4. #3
    padaek's Avatar
    Points: 1,970, Level: 27

    Real Name
    Jurgen
    Location
    Shellharbour Australia
    Joined
    Nov 2016
    Online
    24 Minutes Ago
    Posts
    261 / 0 / 0 / 0
    Motorcycle
    '02 Sprint RS
    Motorcycle
    '90 Le Mans
    Motorcycle
    '15 F800R
    Quote Originally Posted by Number8 View Post
    @Jurgen, the BMW F800GT is reading 70 mph, 113 Km/hour at 4,000 rpm, it would be good if that machine was higher geared, but then 6th gear would be an overdrive with not much performance until 6,000 rpm was reached. Not the best.
    I'm finding the F800 has a very flat torque curve. No real peaks and troughs in the power delivery. It also likes to rev if you ask it to. When I'm just cruising on the open road I could ride all day in 6th gear. If I need to do some rapid over taking dropping down to 5th gear will suffice.

    I'm used to bikes with a tall top gear and these bikes had a five speed gear box. If I could get around 4000 rpm for 120 kph I would be happy.
    padaek - A putrid and fetid smelling fermented fish sauce from Laos. 

  5. Remove Advertisements
    F800Riders.org
    Advertisements
     

  6. #4
    Points: 6,261, Level: 54

    Real Name
    Simon Humphreys
    Location
    Horsham West Sussex
    Joined
    May 2011
    Online
    2 Days Ago
    Posts
    346 / 0 / 10 / 61
    Motorcycle
    '09 F800S
    Best thing to do is try it.

    If I were you I'd also look at reducing the rear sprocket - you may not have enough length in your chain for the bigger front. This way around you can always take a link out. I'd calculate nearest teeth to give 120 @ 4,000.

    I've got an S and am stuck with the gearing as is, but fortunately I find it spot on. You may struggle in top with the higher gearing. You are lucky if you don't have the 3.5-4k flat spot but its certainly there on the standard F800S/ST set up. Some exhausts fill this hole (including my Remus Revolution). Or maybe the higher output has somehow ironed this out?

    Check out Avboden's (IIRC) post on aftermarket exhausts which has dyno print outs which shows the chasm at 3,5k or so rpm. On a stock bike this will be more pronounced with the higher gearing.

  7. #5
    padaek's Avatar
    Points: 1,970, Level: 27

    Real Name
    Jurgen
    Location
    Shellharbour Australia
    Joined
    Nov 2016
    Online
    24 Minutes Ago
    Posts
    261 / 0 / 0 / 0
    Motorcycle
    '02 Sprint RS
    Motorcycle
    '90 Le Mans
    Motorcycle
    '15 F800R
    Quote Originally Posted by simclair View Post
    Best thing to do is try it.

    If I were you I'd also look at reducing the rear sprocket - you may not have enough length in your chain for the bigger front. This way around you can always take a link out. I'd calculate nearest teeth to give 120 @ 4,000.

    I've got an S and am stuck with the gearing as is, but fortunately I find it spot on. You may struggle in top with the higher gearing. You are lucky if you don't have the 3.5-4k flat spot but its certainly there on the standard F800S/ST set up. Some exhausts fill this hole (including my Remus Revolution). Or maybe the higher output has somehow ironed this out?

    Check out Avboden's (IIRC) post on aftermarket exhausts which has dyno print outs which shows the chasm at 3,5k or so rpm. On a stock bike this will be more pronounced with the higher gearing.
    Simon,, I've got an Akrapovic can fitted and there are no flat spots in the power delivery. In fact, torque is almost flat. There's a nice kick in the pants around 5000-5500 rpm though.

    Changing sprockets sizes wouldn't be a terribly expensive project. I'd need to talk to the BMW technician when it's time for a new chain/sprocket set.
    padaek - A putrid and fetid smelling fermented fish sauce from Laos. 

  8. #6
    padaek's Avatar
    Points: 1,970, Level: 27

    Real Name
    Jurgen
    Location
    Shellharbour Australia
    Joined
    Nov 2016
    Online
    24 Minutes Ago
    Posts
    261 / 0 / 0 / 0
    Motorcycle
    '02 Sprint RS
    Motorcycle
    '90 Le Mans
    Motorcycle
    '15 F800R
    Quote Originally Posted by simclair View Post
    Best thing to do is try it.

    If I were you I'd also look at reducing the rear sprocket - you may not have enough length in your chain for the bigger front. This way around you can always take a link out. I'd calculate nearest teeth to give 120 @ 4,000.

    I've got an S and am stuck with the gearing as is, but fortunately I find it spot on. You may struggle in top with the higher gearing. You are lucky if you don't have the 3.5-4k flat spot but its certainly there on the standard F800S/ST set up. Some exhausts fill this hole (including my Remus Revolution). Or maybe the higher output has somehow ironed this out?

    Check out Avboden's (IIRC) post on aftermarket exhausts which has dyno print outs which shows the chasm at 3,5k or so rpm. On a stock bike this will be more pronounced with the higher gearing.
    Duplicate post..
    padaek - A putrid and fetid smelling fermented fish sauce from Laos. 

  9. #7
    Points: 6,261, Level: 54

    Real Name
    Simon Humphreys
    Location
    Horsham West Sussex
    Joined
    May 2011
    Online
    2 Days Ago
    Posts
    346 / 0 / 10 / 61
    Motorcycle
    '09 F800S
    Quote Originally Posted by padaek View Post
    Simon,, I've got an Akrapovic can fitted and there are no flat spots in the power delivery. In fact, torque is almost flat. There's a nice kick in the pants around 5000-5500 rpm though.

    Changing sprockets sizes wouldn't be a terribly expensive project. I'd need to talk to the BMW technician when it's time for a new chain/sprocket set.
    I guessed you had the Akra - sounds like its a good addition if torque curve is flat. If you wait for new chain sprocket time, its ideal to change sprockets and gearing all at the same time. If you go the front sprocket route then it'll be easier to revert to standard if it doesn't work out. In my previous post I assume you just wanted to try it out.

    Best to go with pattern parts I would suggest from cost point of view. You can also choose your own chain make and quality this route.

    Good luck with that.

  10. #8
    padaek's Avatar
    Points: 1,970, Level: 27

    Real Name
    Jurgen
    Location
    Shellharbour Australia
    Joined
    Nov 2016
    Online
    24 Minutes Ago
    Posts
    261 / 0 / 0 / 0
    Motorcycle
    '02 Sprint RS
    Motorcycle
    '90 Le Mans
    Motorcycle
    '15 F800R
    Quote Originally Posted by simclair View Post
    I guessed you had the Akra - sounds like its a good addition if torque curve is flat. If you wait for new chain sprocket time, its ideal to change sprockets and gearing all at the same time. If you go the front sprocket route then it'll be easier to revert to standard if it doesn't work out. In my previous post I assume you just wanted to try it out.

    Best to go with pattern parts I would suggest from cost point of view. You can also choose your own chain make and quality this route.

    Good luck with that.
    I think the F800R has enough mumbo to allow for higher gearing. There are many times I just cruise in 6th gear on open roads and still have enough poke to get around slower traffic. Changing down to 5th or even 4th she'll lift up her skirts and go.. I call 4th gear my mental gear.

    The bike has under 10,000 klms on it. A new chain and sprocket set may be a while away. Timne to think and get more info..
    padaek - A putrid and fetid smelling fermented fish sauce from Laos. 

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •