What do the different sizes mean, like 90mm? Is it a measurement on the bike I need to take? How do I know which size to order for my bike?

It is the length of the stem, center to center. Measure your current stem from center of steering tube to center of (diameter of) handlebar. The longer the stem, the longer the reach. A small change can make a big difference in comfort level. Measure carefully. This is a very nice suspension stem. It takes vibration away from hands.

Is there a sku for ordering one with shims on amazon? my handlebars are 1" (25.4mm)

Shims from Amazon https://www.amazon.com/MUQZI-Handlebar-Aluminum-Bicycle-Conversion/dp/B09BQB9PC1/ref=pd_bxgy_sccl_1/144-7925088-0949638?pd_rd_w=x1LpD&content-id=amzn1.sym.26a5c67f-1a30-486b-bb90-b523ad38d5a0&pf_rd_p=26a5c67f-1a30-486b-bb90-b523ad38d5a0&pf_rd_r=WVEC5RMXZ7MATFBA233V&pd_rd_wg=HciQV&pd_rd_r=d2e06161-e947-4344-b136-a5d96558c876&pd_rd_i=B09BQB9PC1&psc=1

frist of all will this fit a domane alr 31.8 handle bars also do not understand the measurements 6×100 mm

Yes, it will fit. I just installed mine on my Domane SL5. 6 = is the angle of the stem, either 6 degrees rise or 6 degrees lower depending on the way it's installed. 100 = is the length of the stem, from center of steerer tube to center of handlebars.

will this fit my 3 week old Aventon Soltera step though 7 speed ? Thank you

It fits all standard mtb/road/gravel stems, have no idea what size stem your bikes stem takes, sorry.

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🚴‍♂️ Elevate your ride: smoother roads, stronger rides, zero compromises!

EFFORTLESS UPGRADE - Easy install, maintenance-free stem swap that instantly transforms your ride quality.
UNIVERSAL COMPATIBILITY - Fits most modern bikes with standard 28.6mm or oversized 31.8mm steerer tubes and handlebars.
RIDE SMOOTHER GO FURTHER - Up to 70% bump and vibration reduction means less fatigue and more miles in the saddle.
PRECISION TUNED SUSPENSION - 20mm vertical travel with 5 elastomers lets you customize comfort without sacrificing control.
MAINTAIN SPRINT READY RIGIDITY - Forged aluminum design ensures torsional stiffness for confident climbs and sprints.

The REDSHIFT ShockStop Suspension Stem is a high-performance bike handlebar stem engineered to absorb up to 70% of road vibrations and impacts. Compatible with most road, gravel, hybrid, and e-bikes, it features 20mm of vertical suspension travel and 5 adjustable elastomers for personalized comfort. Crafted from forged aluminum, it maintains steering precision and torsional rigidity, making it the perfect upgrade for riders seeking longer, faster, and more comfortable rides without sacrificing control.

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Item Depth	8 centimeters
Mounting Type	Handlebar Mount
Manufacturer	Redshift Sports
UPC	736313570052
Item Package Dimensions L x W x H	7.87 x 2.76 x 2.01 inches
Package Weight	0.35 Kilograms
Item Dimensions LxWxH	1.57 x 3.15 x 1.18 inches
Brand Name	REDSHIFT
Part Number	RS-40-P
Style	Stem Angle: 6 Degree
Size	Length: 80mm

REDSHIFTShockStop Suspension Stem for Bicycles, Shock-Absorbing Bike Handlebar Stem for Road, Gravel, Hybrid, and E-Bikes

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