diff --git a/app/components/bikes.rb b/app/components/bikes.rb
index 4199b5b..9e6f42b 100644
--- a/app/components/bikes.rb
+++ b/app/components/bikes.rb
@@ -33,6 +33,10 @@ class Bikes < Netzke::Basepack::Grid
                                            }
       }
     ]
+
+    # Default the sorting to ASC on shop_id
+    c.data_store.sorters = [{ property: 'shop_id', direction: 'ASC' }]
+
     @bike = Bike.all
     c.prohibit_update = true if cannot? :update, @bike
     c.prohibit_create = true if cannot? :create, @bike
diff --git a/app/models/bike.rb b/app/models/bike.rb
index 722b1b2..e1fa08b 100644
--- a/app/models/bike.rb
+++ b/app/models/bike.rb
@@ -12,9 +12,7 @@ class Bike < ActiveRecord::Base
   belongs_to :bike_condition
   belongs_to :bike_purpose
 
-  default_scope order('shop_id ASC')
-
-  validates :shop_id, :presence => true, :uniqueness => true, :length => { :minimum => 3 }
+  validates :shop_id, :presence => true, :uniqueness => true, :numericality => { :only_integer => true }
   validates :serial_number, :length => { :minimum => 3 }
   validates :model, :length => { :maximum => 50 }
   validates :bike_brand_id, :presence => true
diff --git a/db/migrate/20131019023429_change_bike_shop_id.rb b/db/migrate/20131019023429_change_bike_shop_id.rb
new file mode 100644
index 0000000..5503edf
--- /dev/null
+++ b/db/migrate/20131019023429_change_bike_shop_id.rb
@@ -0,0 +1,23 @@
+class ChangeBikeShopId < ActiveRecord::Migration
+  # We don't use change_column because we have arbitrary strings we
+  # need to strip the characters from to make the integer values
+  def up
+    bikes = Bike.all
+    remove_column :bikes, :shop_id
+    add_column :bikes, :shop_id, :integer, :unique => true
+
+    # deconflict shop ids
+    bikes.each do |bike|
+      new_id = bike.shop_id.gsub(/[^\d]/, '').to_i rescue 1
+      while bikes.map(&:shop_id).include? new_id
+        new_id += 1
+      end
+      bike.shop_id = new_id
+    end
+    bikes.each(&:save)
+  end
+
+  def down
+    change_column :bikes, :shop_id, :string
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 3834603..dd20d89 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -11,7 +11,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20130902201853) do
+ActiveRecord::Schema.define(:version => 20131019023429) do
 
   create_table "bike_actions", :force => true do |t|
     t.string   "action",     :limit => 128, :null => false
@@ -60,12 +60,10 @@ ActiveRecord::Schema.define(:version => 20130902201853) do
     t.integer  "bike_purpose_id",   :null => false
     t.datetime "created_at",        :null => false
     t.datetime "updated_at",        :null => false
-    t.string   "shop_id"
     t.string   "model"
+    t.integer  "shop_id"
   end
 
-  add_index "bikes", ["shop_id"], :name => "index_bikes_on_shop_id", :unique => true
-
   create_table "credit_conversions", :force => true do |t|
     t.integer  "conversion", :default => 1
     t.datetime "created_at",                :null => false
diff --git a/db/seeds.rb b/db/seeds.rb
index 2d77169..b56fc3b 100644
--- a/db/seeds.rb
+++ b/db/seeds.rb
@@ -16,8 +16,10 @@ end
 if BikeBrand.all.empty? and BikeModel.all.empty?
   # Need to use DEFAULT instead of explicit IDs that are used in the sql file,
   # so that the PG table ID sequence is incremented
+  #
+  # Note the drop(1) which assumes we have a junk PRAGMA line at the top
   load_statements = File.readlines(File.join(Rails.root, 'db', 'seed', 'sql', 'bike_brands_and_models.sql')).drop(1).map do |statement|
-    statement.sub(/VALUES\(\d+,/, 'VALUES(DEFAULT,').tap {|x| puts x }
+    statement.sub(/VALUES\(\d+,/, 'VALUES(DEFAULT,')
   end
   ActiveRecord::Base.connection.execute(load_statements.join)
 end
diff --git a/spec/factories/bikes.rb b/spec/factories/bikes.rb
index 15ae066..98629d7 100644
--- a/spec/factories/bikes.rb
+++ b/spec/factories/bikes.rb
@@ -2,9 +2,7 @@
 
 FactoryGirl.define do
   factory :bike do
-    sequence :shop_id do |n|
-      "Shop ID #{n}"
-    end
+    sequence(:shop_id) {|n| n}
     sequence :serial_number do |n|
       "S/N# #{n}"
     end