Bitubo WME / spring rate - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 7 (permalink) Old 05-22-2019, 07:02 AM Thread Starter
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Bitubo WME / spring rate

i would like some help from the forum to help me choose my rear shocks, i have been exchanging emails with the canadian dealer here in Canada, my main concern is getting the right spring for me, im 155 ponds, drive mainly solo mi bike is a 2012 T100. When i ask what spring rate they suggest for me they said " 50kg leaving extra preload adjutment " is that right?

i was expecting 25-30kg/cm.

thank you for your comments.

christian
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post #2 of 7 (permalink) Old 05-22-2019, 12:33 PM
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Not even close. My Hagon's came with 20kg springs that are right for my weight 200 lbs. I to ride solo on my 08 T100.
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Ride safe,

Quentin

Last edited by wenzel850; 05-22-2019 at 12:38 PM.
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post #3 of 7 (permalink) Old 05-22-2019, 01:20 PM
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My Ohlins springs are rated at 18-27 N/MM which is near enough the same as KG/CM
I'm 190lb and the springs work well for me solo or 2 up with extra pre load
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Mine's the black one
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post #4 of 7 (permalink) Old 05-23-2019, 06:19 AM Thread Starter
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i found out that there is 4 spring rate for thr WME ; 1.2-1.7, 1.9, 2.4 (standard) and 3 kg/mm.

they said that for my weight the 2.4 kg/mm (24kg/cm) will be the correct choice.

if 20kg/cm is good for a 200lbs rider, maybe i should go with the 1.9 ??

and the progressive one seem very smooth. 1.2-1.7

Last edited by tlchris; 05-23-2019 at 06:21 AM.
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post #5 of 7 (permalink) Old 05-23-2019, 06:20 AM
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When I priced Bitubo I was told they come with 24kg springs. They were a bit pricey so I went with Hagons fitted with 20kg. I'm 160lb. I probably would have been happy with 24kg, my Hagons sometimes bottom out.
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I'll have you know I come from the best of convict stock.

Last edited by Flash Nick; 05-24-2019 at 02:33 AM.
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post #6 of 7 (permalink) Old 05-29-2019, 07:01 AM Thread Starter
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does a progressive spring like 1.3-1.7 equal a 1.9 standard spring ? and should a progressive spring better than a standard spring?
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post #7 of 7 (permalink) Old 05-29-2019, 07:42 AM
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You did have me confused when you mentioned only the lower Bitubo spring was progressive. I'd be surprised if any manufacturer fitted non-progressive springs. (could be proven wrong). For example all the Hagon springs are progressive, I believe the spring rate represents an average.

The way they work is that the rate is constant until the more closely wound coils bind i.e. coil to coil locked. The remaining active springs is therefore shorter, so each mm of travel puts an increased torque on the coil wire, resulting in a higher spring rate. So you can easily tell if a spring is progressive by the non uniform coil winding.

I can't verify your Bitubo data as I could never find any published info on the available springs, I was only offered 24kg.

I'll have you know I come from the best of convict stock.

Last edited by Flash Nick; 05-29-2019 at 07:55 AM.
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