RSI Settings for Swing Trading Crypto: Why 50–70 Beats 30/70

The textbook says: buy when RSI drops below 30, sell when it goes above 70. In a trending crypto market that advice is close to backwards. Strong uptrends spend weeks with RSI between 50 and 80, and "selling overbought" there means selling strength. Here's how RSI really behaves in trends, and the settings that suit swing trading.

What RSI measures

The Relative Strength Index (J. Welles Wilder, 1978) compares the size of recent up-closes with recent down-closes over a set number of candles, usually 14, and scales it from 0 to 100:

• Above 50: gains have outweighed losses lately. Momentum is with the buyers.
• Below 50: losses have outweighed gains. Momentum is with the sellers.
• Above 70 / below 30: the classic "overbought" and "oversold" zones, where the move is stretched.

Note what it doesn't say: anything about the trend beyond those 14 candles, or about value. Overbought means "risen fast", not "too expensive".

Why 30/70 fails in trending markets

In a range, 30/70 works tolerably: price bounces between support and resistance and RSI swings with it. In a trend, RSI shifts its whole range. A well-known observation among technicians (popularised by Andrew Cardwell) is that in uptrends RSI tends to hold roughly between 40 and 80, and in downtrends between 20 and 60.

So in a healthy uptrend, RSI may never reach 30 at all, and every dip you wait for to "get oversold" passes you by. Meanwhile, readings above 70 keep appearing as the trend pushes on. Using 30/70 as buy/sell levels there gets you out early and in never.

The 50 to 70 band for trend entries

For trend-following, a more useful question is: after a pullback, has momentum swung back to the trend's side, without already being stretched?

• Longs: RSI between 50 and 70 on the entry candle. Above 50 says buyers are back in control; below 70 says you're not buying the top of a spike.
• Shorts: RSI between 30 and 50, the mirror image.

That's the band Cruxlee's rules use on the 4-hour chart, as one of several checks in the EMA pullback strategy. It doesn't find the trade on its own; it filters out the two worst moments to enter: before the turn, and after the move has already run.

RSI settings by use

Use	Setting	How to read it
Swing trading, 4h	RSI 14	Longs on a dip that turns RSI back above 50, below 70; shorts mirrored (30 to 50)
Daily trend check	RSI 14	Above 50 most of the time in a bull trend; failing to reach 60 is a warning
Day trading, 15m to 1h	RSI 14 (or 9)	Same logic, more noise; follow the higher-timeframe trend
Spotting exhaustion	RSI 14	80+ or 20- on the daily: stretched, watch for divergence

Period: 14 is the standard and a good default. Shorter periods (7 or 9) hit the extremes more often, which means more signals and more false ones. Changing the period matters less than changing how you read the levels.

Here's the momentum check on Bitcoin (the highlighted row), updated every 4 hours:

What about RSI divergence?

Divergence is when price makes a new high but RSI makes a lower high (or the mirror for lows). It's a fair warning that momentum is fading, and it shows up before many reversals. It also shows up repeatedly during trends that keep going. Treat it as a reason to tighten up or skip new entries, not as a trade on its own.

RSI is a filter, not a trigger

The most reliable way to use RSI is as one vote among several: trend from moving averages, strength from ADX, participation from volume, and RSI to confirm momentum is on the right side. That stacking of independent evidence is what traders call confluence.

The takeaway

Keep RSI at 14, but stop reading 30/70 as buy/sell levels in trending markets. Use 50 as the line between buyers and sellers, and a 50 to 70 band (30 to 50 for shorts) to time entries after a pullback. Overbought is a description of speed, not a sell signal.