Rear shock. Shims or not? - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 9 (permalink) Old 11-18-2013, 01:42 PM Thread Starter
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Rear shock. Shims or not?

Not really finding a definitive answer on if I should put shims on the stock shock to raise the rear or not. Anyone do this with any success? If so how much and what are your fork heights at? Thanks
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post #2 of 9 (permalink) Old 11-26-2013, 05:32 PM
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I can't remember if people are doing this or not but I would try 5mm in the rear and start with your forks flush.
I want to say i was 5mm shimmed and ended up being first line above the triple but It's been a few years for me.
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post #3 of 9 (permalink) Old 11-26-2013, 05:45 PM
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This might help you decide.

http://www.rc51.org/link.htm

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post #4 of 9 (permalink) Old 11-27-2013, 02:01 AM
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MY SP's about an inch higher in the side stand - than std with raising of the rear mostly & possibly dropping the front (reworked suspension incl. fork springs so I don't know exactly what's raised or lowered. I also dropped the forks slightly through the yokes.

I'd say "yes" do it. Add a spacer. It's a cheap modification to try. A taller rear makes steering considerably more responsive without getting significantly unstable at the front. I still don't feel the need for a steering damper despite how mine is set up. A little twitch of the bars here and there, but I've never felt anything alarming really.

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post #5 of 9 (permalink) Old 11-27-2013, 10:02 AM Thread Starter
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I was advised that I could add shims but it needed to be no more than plus 15mm at the rear axle. So I added a 5mm shim and it changed it 12mm at the rear axle. So it seems that a 5mm spacer is a good start. I am having J.D. Hord redo the forks and will likely set those at stock height on the first line. Need some warmer weather so I can road test...
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post #6 of 9 (permalink) Old 11-30-2013, 02:08 PM
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I've recently serviced my sp and raised the rear with a 4mm spacer, all my bikes are raised at the rear to some point, makes the bike turn in quicker, feel better in the turns

Rob
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post #7 of 9 (permalink) Old 07-22-2016, 06:33 AM
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Where do you get these shims at to rase the rear end ?

Sent from my Samsung Note 5
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post #8 of 9 (permalink) Old 09-15-2016, 11:30 AM
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Go to your local hardware store and buy a washer..... I forget what size? Maybe speedzilla might have the answer?

The washers are all damn near 5mm in thickness. You'll have to either disconnect the rear shock from the frame which is a bitch OORRRR cut the washer into a "U", loosen up the top of the shock where it meets the frame and then slide the shim in between the top of the shock and the frame. Much much easier the second way.

The 5mm shim made a huge difference on my bike... But then again I changed from a 180 to a 190 rear tire at the same time.

For 25cents....it's worth a shot
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post #9 of 9 (permalink) Old 09-15-2016, 05:27 PM
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Try asking an auto body shop or one of their suppliers for a couple door shims. I think they come in variable thicknesses and are U shaped, as mentioned above. I'm just not sure what type of metal they'll be made from. Obviously, you'd want something hardened. Something to keep in mind if you end up going to the hardware store for washers.
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