Will this fit a gt aggressor pro?

This will fit any standard bicycle fork.The height you adjust best for you

Anyone add this to a trek ebike? specifically an allant?

I put it on my Trek Marlin 5 and it works great. It is pretty universal so I suspect it would fit the Trek e-bike. Be aware however that it voids and "warrantee" that you have with Trek. Not a huge deal with my Marlin 5 but with the e-bike it could be significant.

Will this extender fit a 27.5" Villotti /Genesis by Kent?

If your bike has a 1 1/8” non threaded steer tube then it will fit. I would recommend having a local bike shop install it, in case any adjustments are needed.

Will you sell me the long cap screw? I cut mine too short. I’m

no i am using mine look to a hardware store

Bike Stem Riser 28 6mm Handlebar Extender Adjustable Height

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€ 21.35

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Sold byAmazon AustriaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚴‍♂️ Elevate your ride, elevate your status.

ROCK SOLID STABILITY - Dual stainless steel bolts ensure your handlebar stays locked in place, eliminating wobble on every ride.
EFFORTLESS INSTALLATION - Quick setup with included spacers, top cap, and bolt—get back on the road faster and smoother.
UNIVERSAL COMPATIBILITY - Fits 28.6mm threadless steerer tubes—ideal for mountain, road, hybrid, and commuter bikes.
CUSTOMIZE YOUR RIDE HEIGHT - Fine-tune your handlebar position with up to 73mm adjustable rise for ultimate comfort and control.
PREMIUM 6061 ALUMINUM BUILD - Experience the perfect blend of durability and featherlight performance at just 180g.

The TRIWONDER Bike Stem Riser is a precision-engineered handlebar extender crafted from lightweight 6061 aluminum, offering up to 73mm adjustable rise for a more ergonomic riding posture. Featuring dual-bolt clamping for enhanced stability and compatibility with 28.6mm threadless steerer tubes, it’s the perfect upgrade for cyclists seeking comfort, control, and style across MTB, road, and commuter bikes.

Specifications

ASIN	B01N24G2WH
Best Sellers Rank	#56,201 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #30 in Bike Stems
Brand Name	TRIWONDER
Color	01 Black
Customer Reviews	4.6 4.6 out of 5 stars (5,693)
Date First Available	January 20, 2017
Included Components	Stem
Item Package Dimensions L x W x H	5.51 x 3.03 x 1.54 inches
Item Weight	0.18 kg
Manufacturer	TRIWONDER
Material	Aluminium
Model Name	Bike Stem Riser
Number of Items	1
Package Weight	0.18 kg
Part Number	OS0902
Size	123mm
Skill Level	Professional
Sport Type	Cycling
Suggested Users	boys
Warranty Description	18 Months Warranty

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