Ridgeback Dimension 20
Choose their plan
New bikes are delivered brand new.
Refurbished bikes have been cleaned, quality checked, repaired and sanitised to the highest quality before dispatch.
In stock · free delivery in 2–4 days · free returns
The Dimension 20 is where gears properly arrive. Shimano's 7-speed setup, controlled by a single trigger shifter, gives a child their first real experience of choosing a gear to match the terrain rather than just pedalling harder.
At 9.3kg it's a noticeable step up from the single-speed bikes below it, built for longer rides and steeper hills than before. Most riders are ready for the 8-speed Dimension 24 by around age 8.
- Easy-pedal ergonomic cranks
- Narrower grips for small hands
- Lowered frame for easy mount/dismount
- Steering limiter to prevent over-steer falls
- Limited Lifetime Warranty (transferable)
- 7-speed Shimano gearing - Shimano SL-M315 trigger shifter
How exchanges work
Exchange free, whenever you're ready. New bike delivered first, old one collected free.
No fee - your months are simply re-billed at the rate matching the time you kept the bike. Never more than finishing your plan.
Every bike stays a minimum of 6 months. Wrong size? Free swap within 30 days.
You only ever pay the rate for the time you kept the bike.
They'll outgrow it. That's the plan.
Most children ride this size for around 15 months. When knees start hitting handlebars, exchange to Ridgeback Dimension 24 in two minutes - free at the end of your plan, and never more than a small fair adjustment before it.
How exchanges work
Exchange free, whenever you're ready. New bike delivered first, old one collected free.
No fee - your months are simply re-billed at the rate matching the time you kept the bike. Typically £14–£23, never more than finishing your plan.
Every bike stays a minimum of 6 months. Wrong size? Free swap within 30 days.
You only ever pay the rate for the time you kept the bike.
Read the full exchanges pageEvery plan includes
How Wheelies works
Pick the right size with our finder, choose a 6, 12 or 18-month plan (longer is cheaper), and we deliver - free, 95% assembled.
Treat it like your own. Repairs and normal wear are included. Add Laka insurance for theft and accidental damage.
Outgrown it? Swap to the next size from your account - free at the end of your plan, and never more than a small fair adjustment before it. The new bike arrives before the old one goes back.
Done with bikes? Return for free after your 6-month minimum. You only ever pay the rate for the time you kept it.
Parents who made this exact choice
The 16" felt scary-big online but the size finder was right - perfect fit, feet flat.
Woom WOW bikes are perfect for introducing them to kids bikes.
Would very strongly recommend the WOW and also Wheelies.
The WOW was a great way of getting Marnie started on bikes, and she's now on the Go 2.
Loving the WOW. Just received and it's so good.