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Thread: RSV4 1100 RF 2019 Geometry

  1. #1
    apriliaforum newb javounet's Avatar
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    RSV4 1100 RF 2019 Geometry

    Hello everybody,

    Some of your have the new 1100 RF and i'm interesting to know the new geometry of this bike. And so, I read some features on the net but in reality, what about ?

    On the front :
    - Up and Down steering bushing have been change, +1.5, +3, -1.5 ? What is the oem mounting ?
    - Steering offset seems to be back to 30mm ? (32mm since 2015)
    - Front fork has 125mm stroke (120mm before)

    On the rear
    - Swingarm lenght ?
    - TTX spring ?
    - TTX length ?
    - Red plate for linkage ? The same as RF 2017 ?

    After reading workshop manual, it seems that the frame geometry has been changed. Size A and B (beetween swingarm pivot and down bar chassis) are different beetween 1000RF and 1100RF.

    I think these informations could be interesting for many people. And like many people who race on tracks, we are searching traction with the RSV4. That is our case in France with friends and our RF. We can't find good traction and stability on exiting corner and hard acceleration. Difficult to follow S1000RR which are very stable and have very good traction.

    Thanks.

    javounet from France
    Proto 1103cc RSV2002 "Protwin"
    Full race RSV4 RR 2017

    http://latwinteam.over-blog.com/

  2. #2
    apriliaforum expert prettykin's Avatar
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    I'm interest in this topic as well.

    The upper steering head bushing has been replaced on the '19 1100 RF

    17-18 RF steering head bushing = Lower is +3/ Upper is +1.5

    '19 1100 RF steering head bushing = lower is +3/ Upper is +3 Offset has also been reduce to 30mm (from 32mm)

    Apparently the change to a +3 upper bushing decreases rake angle by .5 degrees from '17-'18 RF bikes. A by product of decreasing rake is decreasing Trail. I'm guessing this is why the offset was reduced by 2mm, to add back lost trail.

  3. #3
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    What are the units on the steering head bushings? How do you calculate rake angle change based on the units?

  4. #4
    apriliaforum expert prettykin's Avatar
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    Quote Originally Posted by GJB View Post
    What are the units on the steering head bushings? How do you calculate rake angle change based on the units?
    LOL, you can bet it's not inches... The unit of measurement is Millimeters. Calculating rake angle/trail is a kin to black magic. I got the info from Aprilia press release information.

    According to Technical specs I could find the 2018 RF has a rake angle of 25 Degrees/ 104.8mm of trail. The new 19 1100 factory now has a rake angle of 24.5 Degrees, 103.8mm of trail and a 4mm shorter wheelbase due to the offset and head bushing changes.

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    The math does not work for Millimeters either. If the number is an offset number, the angular change would be greater than 0.5 degrees

  6. #6
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    Well I pulled the front end off and took some measurements. On my 16 model the upper collar is marked 0.49, +1.5 and the lower 0.49, +3.0. I confirmed that 0.49 is the angle due to the offset on the upper and lower (+1.5, +3.0 measured in Millimeters). I am going to switch the upper and lower to be +3.0, +1.5, which should give me -.49 degree change, or a net change of 098 degrees (less rake). I am also going to go from 31mm steering off set to 32. These changes will both decrease trail and make steering quicker, hopefully not too much........

  7. #7
    apriliaforum expert vfr1200's Avatar
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    If the triple clamps are 200 mm apart, and the top is 1.5 mm forward from bottom, rake change
    is arctan 1.5/200, or 0.43 degrees steeper
    2017 Sherco 300 SER Factory
    2016 Tuono 1100 Factory
    2015 TREK 7.3
    https://www.amazon.com/s/ref=nb_sb_n...alan+golightly

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    Yeah, I was off by a factor of 2 for some reason. The distance apart is about 78mm, so the delta angle is about 2 degrees steeper with the swap. So now I dont know what the first # printed on the collar means anymore

  9. #9
    apriliaforum newb javounet's Avatar
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    Quote Originally Posted by prettykin View Post
    LOL, you can bet it's not inches... The unit of measurement is Millimeters. Calculating rake angle/trail is a kin to black magic. I got the info from Aprilia press release information.

    According to Technical specs I could find the 2018 RF has a rake angle of 25 Degrees/ 104.8mm of trail. The new 19 1100 factory now has a rake angle of 24.5 Degrees, 103.8mm of trail and a 4mm shorter wheelbase due to the offset and head bushing changes.
    Where do you find these informations ? In the service manual, the wheelbase are the same : 1435mm.
    Proto 1103cc RSV2002 "Protwin"
    Full race RSV4 RR 2017

    http://latwinteam.over-blog.com/

  10. #10
    apriliaforum expert prettykin's Avatar
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    Quote Originally Posted by javounet View Post
    Where do you find these informations ? In the service manual, the wheelbase are the same : 1435mm.
    Apparently the '19 1100 has a wheel base of 1439mm compared to the '18 RF with 1435mm

    https://www.totalmotorcycle.com/moto...r-factory-1000

    https://www.totalmotorcycle.com/moto...lia-rsv4-rf-le

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