Shimano Cassette Freewheel 14-34 7 Speed

Shimano 7-Speed Freewheel 14–34T (MegaRange style)

Shimano MF-TZ500-7 7-Speed Freewheel 14-34T

What it is

This is a:

• 7-speed screw-on freewheel (not a cassette)
• Shimano Tourney TZ / MF-TZ series
• Gear range: 14–34T (wide range “MegaRange”)
• Designed for entry-level MTB and commuter bikes

Key features

• ✔ 7-speed drivetrain compatibility
• ✔ Screw-on freewheel (threads onto hub)
• ✔ Extra-wide climbing gear (34T sprocket)
• ✔ Steel construction for durability
• ✔ Works with Shimano 7-speed derailleurs

Gear range advantage

Compared to a 14–28T freewheel, this gives a much lower climbing gear:

$\text{Gear Range Ratio} = \frac{34}{14} \approx 2.43$

That means:

• easier climbing (big improvement on hills)
• slower top-end compared to tighter ranges
• better for casual MTB or loaded riding

How it works (important)

• This is still a freewheel system
• The ratchet mechanism is inside the gear block
• It screws directly onto a threaded rear hub

So:

• ❌ not compatible with cassette freehub wheels
• ✔ only works on freewheel-type hubs

Ride feel

• very easy climbing gear (34T helps a lot)
• larger jumps between gears
• heavier drivetrain feel
• slower shifting than modern cassette systems

Best suited for

• entry-level mountain bikes
• commuter / utility bikes
• riders needing easier climbing gears
• replacing older 7-speed freewheels

Pros

• excellent low-end climbing ability
• very affordable
• easy installation
• widely available replacement part
• good for hilly terrain on budget bikes

Trade-offs

• heavier and less efficient than cassette systems
• larger gear gaps (less smooth cadence control)
• limited upgrade path
• requires freewheel-compatible hub

Bottom line

The Shimano 7-speed 14–34T freewheel is a budget-friendly wide-range drivetrain option, designed mainly to make climbing easier on entry-level bikes, trading off smoothness and efficiency for simplicity and low cost.