Fenix TK21R vs Fenix TK25R size comparison

TK21R vs TK25R: how they differ

Size and weight

The Fenix TK21R is the shorter light: 159.5 mm (6.28 in) against 164 mm (6.46 in), a difference of 4.5 mm (3%). At their widest points they are about the same (36 vs 36 mm). The Fenix TK21R is 4 g lighter (221.4 g vs 225 g, with battery).

Brightness and throw

Both are rated at 3,600 lm maximum output. For beam distance the Fenix TK21R reaches further: 480 m vs 350 m rated throw (37% more).

Battery

The Fenix TK21R runs on its own battery (One included 6000mAh rechargeable li-ion); the Fenix TK25R runs on its own battery (One included 5000 V2.0 rechargeable Li-i).

Price

When we checked on Nov 4, 2026, the Fenix TK21R was $134.95 at fenixlighting.com and the Fenix TK25R $139.95 at fenixlighting.com, so the Fenix TK21R cost $5.00 less. Prices change often, so check the current price before you buy.

Type

Both are tactical lights in our catalog with a tube body.

Which should you buy?

Choose the Fenix TK21R if you want a shorter light (4.5 mm shorter) and longer throw (480 m vs 350 m). On the specs we track, the Fenix TK21R is ahead or level everywhere; the Fenix TK25R makes sense mainly if its price, interface or a feature we don't track suits you better. We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.

Check price ↗ Fenix TK21R Check price ↗ Fenix TK25R

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