increased rear suspension travel and want to measure it

Find a graph of the leverage ratio and use it to calculate the new travel. Easiest if it's linear, though that's not the most common.

yes it is about 1 to 3 . but not exactly that. When the rear shock bottomed out with the 10mm spacer, i had a distance of about 3cm from the rear triangle bridge to the seat tube. Now that the stroke went to 50mm i have no space at all. If that is correct i almost went to 150mm of travel , but i don't see it being that much.

I would probably flip the bike upside down and set up where the wheels are close to level with the ground... measure the rear axle from the ground with shock aired up and bottomed out.

If you know your leverage ratio is about 3:1, you added 10mm to your travel, and your tire ends up about 30mm closer to your frame, then yeah, you added about 30mm of travel. If you want to be more precise than that then you need to find your exact leverage curve to calculate the new travel (and probably have to extrapolate the extended curve to correct for overstroking it).

Did you verify this change with the manufacturer or your LBS? I have had a few bikes with rear travel adjustment capabilities included by the mnfr by design. Each setting impacted the maximum tire size. While a too large tire on the rear triangle may not cause a catastrophic accident (like a too large tire locking up a front fork), a too large tire can blemish your frame. At its worst, the tire could wear through clear coat and aluminum/cc and contribute to premature frame failure even though it appears compatible in your work stand.

looks easy from here said:

If you know your leverage ratio is about 3:1, you added 10mm to your travel, and your tire ends up about 30mm closer to your frame, then yeah, you added about 30mm of travel. If you want to be more precise than that then you need to find your exact leverage curve to calculate the new travel (and probably have to extrapolate the extended curve to correct for overstroking it).

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the firm that made the bike doesn't offer that much of an information. And the ones that are provided are somewhat inaccurate.

EatsDirt said:

I would probably flip the bike upside down and set up where the wheels are close to level with the ground... measure the rear axle from the ground with shock aired up and bottomed out.

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thanks, i just did what you said. I measured 14,7 cm of travel

bingemtbr said:

Did you verify this change with the manufacturer or your LBS? I have had a few bikes with rear travel adjustment capabilities included by the mnfr by design. Each setting impacted the maximum tire size. While a too large tire on the rear triangle may not cause a catastrophic accident (like a too large tire locking up a front fork), a too large tire can blemish your frame. At its worst, the tire could wear through clear coat and aluminum/cc and contribute to premature frame failure even though it appears compatible in your work stand.

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thankfully the tire clearance is totally not an issue. Even with the increase i still have 2,5cm of tire clearance. i have 465mm long chainstays. Well as it turns out i have the only downcountry bike with almost 150mm of travel.

Can't you simply divide the original travel by the stroke, then multiply the answer by the new stroke?
Say 165mm of travel with 57mm. Put 63mm stroke on.
165/57=2.894
2.894*63=182mm

What bike and shock is it?

Mudguard said:

Can't you simply divide the original travel by the stroke, then multiply the answer by the new stroke?
Say 165mm of travel with 57mm. Put 63mm stroke on.
165/57=2.894
2.894*63=182mm

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Dividing travel by shock stroke will get you the average leverage ratio. The problem is you're adding travel at the end of the stroke, where the leverage ratio might be quite different from the average. Even so, since you're only changing stroke by ~10%, your calculation would get you reasonably close.

Does it actually matter?

006_007 said:

Does it actually matter?

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Probably depends. If the bike was 150/140 and now it's suddenly been reversed it might feel a bit odd.

Nat said:

What bike and shock is it?

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it is this one. Salvo 29 Trail
but with 27.5 plus tyre.
as you all can see from the manufacturer , the bikes technical data are totally all over the place. for example, the 27.5 tyre bike allegedly has 120mm of travel with xfusion pro rlx 190x40. the 29 version of it (please note that it is the same frame -not a different frame) has 100mm of travel. but scrolling a little down to the techical data it states that it has 110mm of travel. since 2018 this web site has been updated and does not include the 27.5 plus versions. In 2018 technical information stated that the frame was compatible with both 27.5+ tyres and 29 wheels and tyres. also i installed 29x2.3 wheel and tyre from a friends bike, just to see if they'll fit and fitted pretty nicely.