diff --git a/R/step2_helper_data.R b/R/step2_helper_data.R
index 7d440a71..5286a334 100644
--- a/R/step2_helper_data.R
+++ b/R/step2_helper_data.R
@@ -259,7 +259,10 @@ getdts = function(aes, unm, p, q, o, dt, shpvars, layer, mfun, args, plot.order)
 					# the condition has length > 1
 					# Calls: <Anonymous> ... with -> with.default -> eval -> eval -> apply_scale
 					# Detected in types of titles. # Example to illustrate the type of titles
-					if (all(is.ena(l$title))) l$title = paste0(names(v), attr(cls, "units"))
+					unit = if (!is.null(s$unit)) s$unit else ""
+					if (unit != "") unit = paste0(" (", unit, ")")
+					
+					if (all(is.ena(l$title))) l$title = paste0(names(v), attr(cls, "units"), unit)
 				}
 				
 				
diff --git a/R/tm_scale_.R b/R/tm_scale_.R
index 8204f2a8..26981b05 100644
--- a/R/tm_scale_.R
+++ b/R/tm_scale_.R
@@ -269,7 +269,8 @@ tm_scale_rank = function(n = NULL,
 						 labels = NULL,
 						 label.na = NA,
 						 label.null = NA,
-						 label.format = list()) {
+						 label.format = list(),
+						 unit = "rank") {
 	structure(c(list(FUN = "tmapScaleRank"), as.list(environment())), class = c("tm_scale_rank", "tm_scale", "list"))
 }
 
diff --git a/R/tmapChart.R b/R/tmapChart.R
index a14dfc40..9a1ad086 100644
--- a/R/tmapChart.R
+++ b/R/tmapChart.R
@@ -105,7 +105,7 @@ bin_num = function(x1, breaks_def, chart) {
 	if (is.null(chart$breaks)) {
 		if (!predefined) {
 			breaks = pretty(x1)
-			ids = 1L
+			ids = rep(1L, length(breaks) - 1)
 			
 		} else {
 			breaks = breaks_def
@@ -117,10 +117,10 @@ bin_num = function(x1, breaks_def, chart) {
 		
 		break_mids = (breaks[-1] + head(breaks, -1)) / 2
 		
-		if (!is.null(breaks_def)) {
+		if (predefined) {
 			ids = as.integer(cut(break_mids, breaks_def, include.lowest = TRUE, right = FALSE))
 		} else {
-			ids = 1
+			ids = rep(1L, length(breaks) - 1)
 		}
 		
 	}
diff --git a/R/tmapScaleRank.R b/R/tmapScaleRank.R
index a22c4c76..a6eaba90 100644
--- a/R/tmapScaleRank.R
+++ b/R/tmapScaleRank.R
@@ -165,15 +165,23 @@ tmapScaleRank = function(x1, scale, legend, chart, o, aes, layer, layer_args, so
 			limits = limits
 		})
 		# NOTE: tr and limits are included in the output to facilitate the transformation of the leaflet continuous legend ticks (https://github.com/rstudio/leaflet/issues/665)
+		chartFun = paste0("tmapChart", toTitleCase(chart$summary))
+		
+		chart = do.call(chartFun, list(chart,
+									   bin_colors = NULL,
+									   breaks_def = NULL,
+									   na.show = na.show,
+									   x1 = x1))
+		
 		
 		if (submit_legend) {
 			if (bypass_ord) {
-				format_aes_results(vals, legend = legend)
+				format_aes_results(vals, legend = legend, chart = chart)
 			} else {
-				format_aes_results(vals, ids, legend)			
+				format_aes_results(vals, ids, legend, chart = chart)			
 			}
 		} else {
-			list(vals = vals, ids = ids, legend = legend, bypass_ord = bypass_ord)
+			list(vals = vals, ids = ids, legend = legend, chart = chart, bypass_ord = bypass_ord)
 		}
 		
 	})
diff --git a/R/tmap_options.R b/R/tmap_options.R
index 53722785..0add6d2a 100644
--- a/R/tmap_options.R
+++ b/R/tmap_options.R
@@ -156,7 +156,8 @@
 												 outliers.trunc = c(FALSE, FALSE), 
 												 trans = "identity",
 												 limits = list(fill = NA, col = NA, 0)),
-							   rank = list(n = 5)), # NA means take data range, 0 means include 0
+							   rank = list(n = 5,
+							   			unit = "rank")), # NA means take data range, 0 means include 0