Bicycle Archive · Specification report

2021 Jamis Explorer A2

Velopedia Archive ID 900001708

Overview

Model year	2021
Brand	Jamis
Model	EXPLORER A2
Bicycle type	Mountain
Archive ID	900001708
Original MSRP	$589.95
Colors	M: Deep Blue, Gloss Black S/T: Sage or Deep Blue
Sizes	15″; 17″; 19″; 21″; 14″ S/T; 16″ S/T; 18″ S/T
Weight	30.50 lbs

Frameset

Frame construction	6061 TIG-welded aluminum, all-new sport comfort design with upright ride position, replaceable derailleur hanger
Frame material	Aluminum
Fork	Hi-tensile steel unicrown, radius blades with dropout eyelets
Fork material	Steel

Drivetrain

Component group	Shimano TY300 rear and TY510 top swing/dual pull front
Shifters	Shimano EZ-Fire Plus, ST-EF500, 21-speed
Front derailleur	Shimano TY300 rear and TY510 top swing/dual pull front
Rear derailleur	Shimano TY300 rear and TY510 top swing/dual pull front
Crankset	Forged alloy, 48/38/28T, 170mm with chainguard
Bottom bracket	Sealed cartridge, 68 x 110.5mm
Cassette	Shimano freewheel 7-speed, 14-34
Chain	KMC Z7
Pedals	Comfort platform with TPE non-slip insert

Brakes

Brakes	ProMax alloy direct pull brakes with Shimano levers

Cockpit & contact points

Headset	Internal cup, threaded, 1 1/8”
Handlebar	Comfort hi-rise, steel, 25.4 x 80mm rise x 15 ̊ sweep x 640mm
Stem	Jamis alloy, angle-adjustable, 90mm ext x 150mm quill (14 ̊18”) or 110mm ext x 180mm quill (19 ̊21”)
Saddle	Jamis Comfort with extra thick padding, synthetic suede top, burnished side panels and bumper springs
Seatpost	Alloy micro-adjust, 350mm x 27.2mm, with alloy QR clamp

Wheels & tires

Wheels	Alloy 36H rims, Formula alloy hubs, QR front and rear, 14g stainless steel spokes
Front tire	CST – 1918, 27.5 x 2.1
Rear tire	CST – 1918, 27.5 x 2.1
Wheel size	27.5

Geometry · 15″

Effective top tube	569 mm
Head tube	155 mm
Head-tube angle	69°
Seat-tube angle	71°
Chainstay / rear center	450 mm
Wheelbase	1059 mm
Bottom-bracket height	284 mm
Standover height	727 mm
Fork offset / rake	42 mm

Geometry · 17″

Effective top tube	587 mm
Head tube	175 mm
Head-tube angle	70°
Seat-tube angle	71°
Chainstay / rear center	450 mm
Wheelbase	1066 mm
Bottom-bracket height	284 mm
Standover height	768 mm
Fork offset / rake	42 mm

Geometry · 19″

Effective top tube	598 mm
Head tube	195 mm
Head-tube angle	70°
Seat-tube angle	71°
Chainstay / rear center	450 mm
Wheelbase	1077 mm
Bottom-bracket height	284 mm
Standover height	808 mm
Fork offset / rake	42 mm

Geometry · 21″

Effective top tube	618 mm
Head tube	220 mm
Head-tube angle	70°
Seat-tube angle	71°
Chainstay / rear center	450 mm
Wheelbase	1097 mm
Bottom-bracket height	284 mm
Standover height	847 mm
Fork offset / rake	42 mm

Geometry · 14″ S/T

Effective top tube	557 mm
Head tube	160 mm
Head-tube angle	69°
Seat-tube angle	72°
Chainstay / rear center	450 mm
Wheelbase	1057 mm
Bottom-bracket height	284 mm
Standover height	478 mm
Fork offset / rake	42 mm

Geometry · 16″ S/T

Effective top tube	578 mm
Head tube	170 mm
Head-tube angle	69°
Seat-tube angle	71°
Chainstay / rear center	450 mm
Wheelbase	1067 mm
Bottom-bracket height	284 mm
Standover height	483 mm
Fork offset / rake	42 mm

Geometry · 18″ S/T

Effective top tube	594 mm
Head tube	180 mm
Head-tube angle	69°
Seat-tube angle	71°
Chainstay / rear center	450 mm
Wheelbase	1072 mm
Bottom-bracket height	284 mm
Standover height	486 mm
Fork offset / rake	42 mm

Manufacturer-published archive data. Confirm exact standards and dimensions before ordering parts or performing service. Generated by Velopedia on September 13, 2026.