What is the maximum pressure this pump can reach?

Giyo rates the GM-821 for high pressure road applications. The dual-piston design is efficient but reaching 100+ PSI for road tyres requires sustained effort — the pump is optimised for MTB and hybrid pressure ranges (30-80 PSI).

Does the gauge stay accurate over time?

Inline gauges on mini pumps are accurate to plus or minus 5 PSI when new. With heavy use, recalibrate periodically against a trusted floor pump gauge. Replace if the gauge drifts more than 10 PSI.

Can this be mounted on a bottle cage boss?

The GM-821 is a hand pump carried in a bag or pocket rather than frame-mounted. For frame mounting, Giyo offers separate frame pump models.

Giyo

Giyo GM-821 Handpump

Name: Giyo GM-821 Handpump
Brand: Giyo
SKU: GM-821
Price: 1899.00 INR
Availability: InStock
Author: InstaSport Editorial

₹1899.00

Description

2-Tone T-handle 6063 Aluminum barrel Universal hose rotate storage for better operation Operate like a micro floor pump Reversible presta and schrader 2-Piston pushing for better Performance Precise in-line gauge