Size & Assembly Guides

/Size & Assembly Guides

Size, Comfort & Safety

Picking the right size bike for you is important for both comfort and practical reasons. A bike that doesn’t fit correctly can cause back problems as well as slow you down on the road!  Please see below a basic size guide we have put together for when ordering your bike! You can also visit our store for a more accurate idea of the correct size bike. For your safety, and for legal reasons, we require that you have your bike assembled and adjusted by a trained competent cycle mechanic before use.

You must seek professional advice before using the product. As the owner of the product you are solely responsible for the cost of correct assembly and properly maintaining it in a safe operating condition.

saddle
SEAT POST

The top of the seat tube (where the seat post fits into the frame) marks the uppermost point when measuring an Adult Bike

pedals
PEDAL CRANKS

The centre of the bottom bracket axle (the axle which carries the pedal cranks) is the lower point when measuring an Adult Bike

handlebars
HANDLEBARS

Can you sit on the saddle, feet on tip-toes touching the ground on either side, while able to reach the handlebars comfortably?

Choosing the Right Size

Adult bike sizes are normally measured from the top of the seat tube (where the seat post fits into the frame) down to the centre of the bottom bracket axle (the axle which carries the pedal cranks).  With the correct frame size you should be able to sit on the saddle with your feet on tip-toes touching the ground on either side, and you must be able to reach the handlebars comfortably.

It is sometimes worth considering a smaller frame with the saddle raised slightly in order to obtain a more comfortable reach.

BikesOrBicycles Recommends

The sizing below gives a guide to frame sizes against inside leg measurements. The correct way to measure your inside leg is from your crotch to the floor making sure that your feet are flat on the ground. Depending on the size of your upper body the best fit may be within 1″ (2 or 3 cms) on either side of these measurements. Make sure you know what size bicycle you require before purchasing.

CHILDREN’S BIKE SIZING GUIDE
AGE GUIDE YOUR INSIDE LEG LENGTH BIKE WHEEL SIZE BIKE FRAME SIZE
Age 3+13" - 16"12"8" - 9"
Age 4+16" - 20"14"9" - 10"
Age 5+17" - 20"16"10" - 11"
Age 6+19" - 22"18" - 20"10" - 11"
Age 7+20" - 23"20"12"
Age 7+21" - 24"20"12"
Age 8+22" - 26"24"13"
Age 8+23" - 26"24"13"
Age 8+24" - 27"24"14"
Age 9+24" - 28"26"14"
Young Teens27" - 32"26"17"
HYBRID BIKE SIZING GUIDE
YOUR HEIGHT YOUR INSIDE LEG LENGTH BIKE FRAME SIZE
4'11" - 5'3"25" - 27"13" - 15"
5'3" - 5'7"27" - 29"15" - 17"
5'7" - 5'11"29" - 31"17" - 19"
5'11" - 6'2"31" - 33"19" - 21"
6'2" - 6'4"33" - 35"21" - 23"
6'4" and up35" and up23" and up
MOUNTAIN BIKE SIZING GUIDE
YOUR HEIGHT YOUR INSIDE LEG LENGTH BIKE FRAME SIZE
4'11" - 5'3"25" - 27"13" - 15"
5'3" - 5'7"27" - 29"15" - 17"
5'7" - 5'11"29" - 31"17" - 19"
5'11" - 6'2"31" - 33"19" - 21"
6'2" - 6'4"33" - 35"21" - 23"
6'4" and up35" and up23" inches and up
ROAD BIKE SIZING GUIDE
YOUR HEIGHT YOUR INSIDE LEG LENGTH BIKE FRAME SIZE
4'10" - 5'1"25.5" - 27"46cm - 48cm
5'0" - 5'3" 26.5" - 28" 48cm - 50cm
5'2" - 5'5" 27.5" - 29" 50cm - 52cm 
5'4" - 5'7"28.5" - 30"52cm - 54cm 
5'6" - 5'9"29.5" - 31"54cm - 56cm
5'8" - 5'11"30.5" - 32"56cm - 58cm
5'10" - 6'1"31.5" - 33"58cm - 60cm
6'0" - 6'3"32.5" - 34" 60cm - 62cm
6'2" - 6'5" 34.5" - 36" 62cm - 64cm 

Putting it all Together

At BikesOrBicycles we recommend having a qualified-mechanic assemble your bike whenever possible. Whilst all bikes bought in-store at our shop on 47 Upper Clanbrassil Street, our bikes sent for delivery arrive 85% assembled. This means there is 30-45 minutes of assembly needed before you are road ready!

In the case where you do not employ a mechanic to assemble your bike we have provided a simple generic assembly guide to help you. All bikes come with the tools required to assemble your bike. Please see below our assembly guide as well as some assembly videos for specific bike brands and models:

Build Guide – Approx 30 Minutes
  1. Open carton at the top - take care of staples in top flap. 
  2. Remove all parts from the carton - you may need assistance.   
  3. First, remove the main section consisting of bike frame, rear wheel, handlebar/stem and front wheel that are tied together. 
  4. Then, remove the saddle/seat post and the small box that holds the pedals, reflectors, tools and full owners manual. 
  5. If you do not have a work stand place the main section upright on a flat floor so it is resting on the rear wheel and the fork end. 
  6. Untie the handlebar/stem section and carefully remove from frame and front wheel. Remove any protective packaging. Turn and twist the handlebar/stem section so cables are at the front and insert stem into head tube. No cables should be to the rear of the bars or twisted or kinked. Ensure the forks are facing forward with the front brake to the front. Tighten to desired height ensuring minimum insertion mark is not visible. Refer to tighten force guides within main manual.
  7. For a BMX, you may need to remove stem front or top cap and insert handlebar, reposition stem cap and tighten handlebar into place. You may need to attach the brake cables to the gyro / roto plates (see separate guide with bike).
  8. Untie the string holding the front wheel - take care to ensure the crank arm slides out from the spokes smoothly. Remove plastic spacer with fork ends. Loosen axle nuts on wheel and then insert front wheel in fork ends.  Note: You may need to loosen front brake to allow the front wheel past the brake blocks.  Ensure safety washers are located correctly and retighten axle nuts. Readjust front brake by pinching together so block meet rim and retighten cable holding nut/bolt. Refer to tighten force guides within main manual. 
  9. If required, fit rear reflector on seat post and then put saddle/post section into frame.  Position into desired position and tighten into place. Ensure minimum insertion mark is not visible. Refer to tighten force guides within main manual. 
  10. To fit the pedal needs care and attention. They are labelled "R" (right) and "L" (left). "R" (Right) is the right hand side as you sit on the bike (chain wheel side).  Locate pedal spindle against the hole in the chain wheel crank arm. Turn clockwise by hand to get the tread started. Then, fully tighten using a spanner.  The left side follows the same procedure but this pedal is tightened anti-clockwise. Refer to tighten force guides within main manual. 
  11. Fit bell on to handlebar. 
  12. Inflate tyres to correct pressure as indicated on tyre sidewall and you are ready to ride.
  13. For a BMX, you may need to fit pegs on to the wheel hub axles by screwing them on. Again, refer to recommended tightening forces in main manual. If not pre-fitted, you will need to fit the chain guard by using the brackets provided.
  14. Regular maintenance and checks are important. So, check all nuts and bolts are fully tightened and all parts are functioning correctly before each ride. 

We strongly recommend that you have your bike assembled and check before riding by a qualified cycle mechanic

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