Thruxton R front suspension adjustement - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 9 (permalink) Old 10-18-2019, 02:04 PM Thread Starter
Minitwins
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Question Thruxton R front suspension adjustement

I am looking for information: tutorials, instruction videos or articles, hints on front suspension adjustment on Thruxton 1200 R.
Admittedly I am totally ignorant of what are "spring preload", "rebound and compression dampening" and how they affect the ride.
Being an engineer I would love to understand it all better. More importantly, perhaps there are some rules on the thumb or other
tips on how to set these up?

I am quite heavy (~200 pounds, ~90 Kg). I owe my new Thruxton for just a few days and have not formed an opinion about suspension while riding (it seems OK), but I noticed that when I stop the front dives quite deep. This is something I think I want to adjust.
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post #2 of 9 (permalink) Old 10-18-2019, 02:50 PM
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post #3 of 9 (permalink) Old 10-18-2019, 02:55 PM
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I think you should be posting this in water cooled twins.

I would start by checking it's on the standard road settings from the manual even though it's a new bike.
Firstly I would get your sag settings right as that is dependent on your weight, that would be adjusted with the preload front and rear.
Can be done on your own but easier with a mate to help.


After that I would put cable ties around your fork and shock damper rod and go out and ride on your normal roads at your pace and then see how much of the total suspension travel you're using, this will give you a guide on which direction to go.
I find I usually set my bikes up just to cope with our terrible roads rather than for any handling benefits, as the bikes are way better than I am in the corners.
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post #4 of 9 (permalink) Old 10-18-2019, 05:24 PM
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A friend of mine has a thrux R and the suspension seems to be set for track use (over-damper) and backing damping adjusters off to min has improved it but i think it needs the damping in forks and shocks reducing by re-valving to be better for the road.

Why is the forks diving under braking an issue for you?
i regard this as a desirable trait as it allows more weight transfer during braking which reduces the chance of the front wheel locking under hard braking, also the dive sharpens the steering angle to aid turn-in for cornering.

who wudda thought id wanna bonneville!
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post #5 of 9 (permalink) Old 10-18-2019, 09:17 PM Thread Starter
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Quote:
Originally Posted by mike-tt special View Post
Why is the forks diving under braking an issue for you?
i regard this as a desirable trait as it allows more weight transfer during braking which reduces the chance of the front wheel locking under hard braking, also the dive sharpens the steering angle to aid turn-in for cornering.
Good question. I never had such noticeable diving on any of my previous bikes and so it feels strange to me.
One consideration is that it dives pretty hard even during moderate braking. Not sure what would happen if I break really hard. Will check
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post #6 of 9 (permalink) Old 10-18-2019, 09:32 PM Thread Starter
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Thanks! This is what I was looking for. Quick question: in this video for sag settings he mentions some numbers which probably depend on the bike and rider's weight. How can I come up with reasonable numbers for my bike and weight?

More generally speaking, are there shops that can help me to tune my suspension? Maybe the dealer? Or most people do it themselves?
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post #7 of 9 (permalink) Old 10-18-2019, 09:36 PM Thread Starter
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I also found this:
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post #8 of 9 (permalink) Old 10-18-2019, 10:37 PM
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Quote:
Originally Posted by krokodil View Post
More generally speaking, are there shops that can help me to tune my suspension? Maybe the dealer? Or most people do it themselves?
Call Ohlins in NC and ask them for an Ohlins certified shop near you. They'll have special tools so that your suspension doesn't get scratched and will dial you in.
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post #9 of 9 (permalink) Old 10-19-2019, 08:01 PM
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Quote:
Originally Posted by krokodil View Post
Thanks! This is what I was looking for. Quick question: in this video for sag settings he mentions some numbers which probably depend on the bike and rider's weight. How can I come up with reasonable numbers for my bike and weight?

More generally speaking, are there shops that can help me to tune my suspension? Maybe the dealer? Or most people do it themselves?
Most people would say around 25%-33% of the travel which is approx 30-40mm front and rear rider sag for a road bike(including the Thruxton) but there's no hard and fast figure.
It should be the same for riders of any weight that's why you adjust the preload. If you can't get it in the ball Park with the preload then you need harder or softer springs.
Once the sag is set and the bike is not sat too high or low in the travel at either end you could play about with the damping settings using the book settings as a guide. I tend to adjust mine to cope with bumps and in the braking area as it's our bumpy roads that slow me down more than any corners, most people including myself are so far below the cornering limits of a modern bike that a few clicks here or there won't make any difference.
It's nothing you can't do yourself, it costs nothing to adjust it and go for a ride but there is plenty of people who will gladly take your money, some are better than others, that's the tricky part.
I would definitely not recommend a dealer.
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