best way to measure maximum swingarm travel - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 21 Old 10-04-2016, 06:34 PM Thread Starter
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best way to measure maximum swingarm travel

working on fabricating a battery box for my auxiliary battery

DS42B24R battery dimensions are, Length (In): 9-5/16 Inch,Width (In): 5-1/16 Inch, Height (In): 8-15/16 Inch

outside dimensions of my box will be 5¼wide x 9½long x 9¼tall

a cardboard cutout tells my I have to notch my inner fender and maybe the tail, tightest clearance will be directly under the mounting bolt that is under the seat to the top of the chain guard.... will 2½" clearance to the chain guard be enuf at that point?

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post #2 of 21 Old 10-04-2016, 06:44 PM
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I don't know if this would work or not, but could you use a couple of heavier duty ratchet straps on each side of the swingarm, anchor them to the rear part of the frame somewhere (I don't have a Strom any more, so I can't go look at a likely anchor point) and then compress the straps on each side until you reach the maximum travel point? You could then check if you have enough clearance for your project.

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post #3 of 21 Old 10-04-2016, 06:50 PM Thread Starter
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I like that concept, I will have to get some real heavy ratchet straps, I don't have stock spring, my WP shock is sprung for 2up+ cargo, 600lbs total

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post #4 of 21 Old 10-04-2016, 06:57 PM
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I'd probably have someone sit on it while you're taking the slack out of the straps; it'll be less work for you if the suspension is already compressed a bit.

I don't know how strong the rear of the frame is for something like this, so I can't vouch for how the bike would act. I'm guessing it should be fine, since the rear area of the bike is supporting two passengers plus gear.

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post #5 of 21 Old 10-04-2016, 07:05 PM
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We fully (or darn near to it) compressed the suspension on my V2 with heavy straps when the Happy Trails folks were checking to see if a larger pannier requested by an out-of-state customer would hit the ground on cornering. It's possible. Use a couple straps and have a (heavy) friend help compress the suspension while compressing and decompressing. BTW, the larger pannier would hit the ground before the peg and was therefore a no-go. Unloading the pre-load may help.

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post #6 of 21 Old 10-05-2016, 06:51 PM Thread Starter
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I tied her down today, as much as I could compress my spring, certainly felt like a hard tail

my cardboard cut out fits with ¼" to spare, I may be able to gain ½" as I made my cardboard cut out an extra ½" taller than need be to have extra room for battery cable to the posts.

I may also gain some with an aftermarket chain guard that is tighter clearance to the top of the chain

it will be an ordeal to actually install the battery, but with a top cover that slides off, I should have easy access to the terminals


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post #7 of 21 Old 10-05-2016, 07:50 PM
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It's a little more work, but taking the shock spring off will give you the most accurate results.
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post #8 of 21 Old 10-05-2016, 07:54 PM
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Gonna use the extra battery for? If you don't need it for starting the bike, might think about getting a couple of the lithium ion 'jumpstart' power sources and rigging them with a 12v charger to keep them charged. Most would be small enough to fit under the seat without alterations, and store a remarkable amount of energy for the volume. The charger would presumably isolate them from the main battery, so you could run the aux batteries all the way down (as far as they'll go) without jeopardizing starting capability.
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post #9 of 21 Old 10-05-2016, 08:46 PM
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Quote:
Originally Posted by RichDesmond View Post
It's a little more work, but taking the shock spring off will give you the most accurate results.
Will it? It seems to me that the shock absorber would compress further without the spring that with it; even if the spring was totally compressed to the point where it couldn't be compressed any further, my guess is that the shock would still have a bit more travel before it was fully compressed (if the spring wasn't present). I don't think the shock would "bottom out" at the same exact point that the spring does, and it can't bottom out before the spring, or else the shock would be damaged if you hit a bump so hard that the spring was totally compressed, even if for just a millisecond. If you took a measurement of how far the swingarm would compress without the spring, it might lead you to believe that you have less clearance for a project than you actually have, which consequently might lead you to believe that your project wouldn't fit when in fact it would.

I think the only accurate way to measure the sort of clearance that OydnaR needed is to compress the actual suspension until it totally bottoms out; then you'll know exactly how much room you have

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post #10 of 21 Old 10-05-2016, 08:59 PM
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The spring doesn't coil bind. It's the shock that limits travel, not the spring.
realshelby and Spec like this.

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'07 DL650, '01 DR-Z400S, '99 SV650 (race bike), '80 GS1000S, '85 RZ350, '08 Ducati 848
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