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Coil shock static bb height

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Coil shock static bb height

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flag stik1
Posted: Dec 25, 2025 at 6:02 Quote
Hi, I have a giant reign 2020 model with a rs sdu air 205x60 and the static bb height (ground to the middle of the crank hole) is about 342.5mm. Then i have installed rs vivid coil 205x60 and the static bb height went up about 347.5mm. Is this normal or am I missing something? I think that the coil is a 205x65 with a 5mm spacer and only if it compresses goes down to 60mm. But in a full extended position is a 65mm so I assume that the static bb height goes up.
What do you think? Thanks
flag lookseasyfromhere
Posted: Dec 25, 2025 at 7:40 Quote
I think that 5mm of bb height doesn't matter.
flag bermblaster10
O+
Posted: Dec 25, 2025 at 12:13 Quote
Totally normal.
Most coil shocks (like the Vivid) sit slightly longer at top-out than air shocks. If yours is effectively a 205×65 with a spacer, it’ll extend more when unweighted, which raises static BB height. Once sagged, it should settle back close to normal. Nothing wrong here.
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