Progressive Rear Springs 105/150 (PR) - Black - 03-1368B

The Progressive Rear Springs 105/150 (PR) – Black (03-1368B) are a dual-rate replacement spring set from Progressive Suspension, engineered as a direct upgrade for motorcycle rear shock absorbers that use standard replaceable coil springs. Sold as a matched pair, these black-finished springs are built to deliver a plusher initial ride and firmer support once you get into heavier compression — a common upgrade for riders who want more control without sacrificing everyday comfort.

Key Features & Benefits

• Progressive dual-rate design (105/150): starts softer for smoother small-bump absorption, then ramps up stiffness as the shock compresses further — helpful for two-up riding, added luggage, or aggressive road conditions.
• Sold as a pair (PR): both rear shock springs are included so you can replace the full set at once for balanced, even suspension performance side-to-side.
• Black finish: a clean, factory-style look that blends in with OEM and aftermarket shock bodies.
• Progressive Suspension build quality: a recognized name in motorcycle suspension components, offering a straightforward bolt-in replacement for worn or sagging factory springs.

Specifications

• Brand: Progressive (Progressive Suspension)
• Part Name: Rear Springs 105/150 (PR)
• Color: Black
• MPN: 03-1368B
• SKU: PGR03-1368B
• Sold as: Pair (2 springs)
• Approximate package dimensions: 6.70″ W x 3.20″ H x 16.80″ D

Fitment

These 105/150 rear springs are designed as a replacement spring set for motorcycle rear shock absorbers that accept standard aftermarket coil springs of this rate and dimension. Because rear shock spring compatibility varies significantly by make, model, and shock design, we recommend confirming your motorcycle's exact rear shock spring specifications before ordering. If you're unsure whether the 03-1368B springs match your bike's shocks, our fitment team can help verify compatibility prior to purchase.

What's in the Box

• One (1) pair of Progressive Rear Springs, 105/150 rate, Black finish

Why Buy from ThreePiece.us

ThreePiece.us backs every order with expert fitment support to help you confirm the right spring rate and dimensions for your shocks before you buy. Every order ships free, and you can spread the cost out with Affirm financing at checkout. If you have questions about compatibility with your specific motorcycle, our team is ready to help you get it right the first time.

Frequently Asked Questions

Are these springs sold individually or as a pair?
The 03-1368B is sold as a pair (PR), so both rear shock springs are included in this listing.

What does the 105/150 rating mean?
It refers to the spring's dual-rate design — a lighter initial rate for a smoother ride under light loads, progressing to a firmer rate as the spring compresses further under heavier loads or two-up riding.

Will these fit my motorcycle's rear shocks?
Fitment depends on your shock's spring dimensions and rate requirements. Reach out to our fitment team before ordering if you're not certain these match your bike's shock specifications.

Does ThreePiece.us offer financing or free shipping on this item?
Yes — this item ships free, and Affirm financing is available at checkout if you'd like to spread out the cost.