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2021 X-Large SKU: BMT21914

Polygon Siskiu T7 Mountain Bike - 2021, X-Large

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TPC Guarantee

Every bike receives our white glove, Certified Pre-Owned treatment, including a full pro-tune by our Master Mechanics in Louisville, CO. All CPO bikes are pristine and rolling beautifully before we pack and ship to your door.

Master Mechanic's Notes
- Front & rear brake bleeds, firming up lever pull & creating consistent grab.
- Paint chip & scratches on drive side down tube.
- Light to moderate scratches on rims & spokes.
- Light scuff on rear derailleur.

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141-Point Inspection

This bike passed our 141-point inspection to qualify to be a Certified Pre-Owned bike. It's free of structural damage and is in excellent cosmetic shape.

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30-Day Hassle-Free Returns

Shop with confidence. Every bike is covered by our 30-day satisfaction guarantee. If this bike isn’t perfect for you, get in touch and we’ll help you find the right bike.

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RideFast Shipping

Assemble your bike in 15 minutes or less! Our bikes ship in our RideFast box for speed and safety. All tools you need to assemble are included.

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Year 2021
Brand Polygon
Model Siskiu T7
Size X-Large
Frame Material Aluminum
Drivetrain Shimano, 1x12 spd
Weight 37 lbs 3 oz
Fork RockShox Recon RL
Fork Travel 140mm
Rear Shock RockShox Deluxe Select+ DebonAir
Rear Shock Travel 140mm
Brakes Tektro Orion M735 4+2 Piston, Disc - Hydraulic
Shifters Shimano Deore M6100, Mechanical
Rear Derailleur Shimano Deore M6100
Bottom Bracket Shell Threaded
Crankset Shimano MT510 , 32t, 175mm
Cassette Shimano Deore M6100, 10-51t
Chain Shimano
Handlebar Entity Expert Alloy, 780mm
Headset FSA Integrated
Stem Entity Expert Alloy , 35.0mm x 35mm, 0°
Seatpost TranzX Dropper , 30.9mm
Seatpost Travel 170mm
Saddle Entity Xtent
Front Axle Spacing 15x110mm (Thru-Axle)
Rear Axle Spacing 12x148mm Boost
Wheelset Entity XL2 Disc Aluminum Tubeless Ready , Shimano MT410
Front Tire Veetire Flow Snap Tackee Compound TR, 29" x 2.6"
Rear Tire Veetire Flow Snap Tackee Compound TR, 29" x 2.6"
Tire Type Tubeless
Tubeless Compatibility Bike ships tubeless


Recommended Rider Height 6'2" - 6'5"
a. Effective Top Tube 652.4 mm
b. Seat Tube 430 mm
c. Seat Tube Angle 76.5°
d. Head Tube Angle 65.5°
e. Head Tube 120 mm
f. Stack 634.9 mm
g. Reach 500 mm
h. Standover Height 695.9 mm
i. Saddle Height Range 660 - 770 mm

“I love this company! My beautiful bike arrived promptly, was packed brilliantly, and tuned perfectly. It was exactly as described.”

— Kari K.


“In the past month, I purchased a road bike and MTB from TPC. Very happy with the price and condition of both bikes! I was riding the bikes 10 minutes after I received them.”

— David H.

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