Challenge Flex 20 Inch Commuter Bike - Unisex332/4604


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About this product

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The Challenge Flex is an ideal commuter bike, with city style tyres and reliable microSHIFT gears. Designed to help you beat traffic and get to work easily and quickly, this beautifully finished bike with a black steel frame, rigid suspension and 6 gears with Revoshift shifters, is a classic, rapid and lightweight alternative to the normal bicycle.

  • Steel frame.
  • 6 gears.
  • Twist grip shifters.
  • microSHIFT MS12-6R gears.
  • Shimano RD-TY18 rear derailleur.
  • Front V-type and rear V-type brakes.
  • Rigid suspension.
  • Steel forks.
  • Weight fully assembled 14kg.
  • 13 inch frame size.
  • 20 inch wheel size.
  • 14 to 33.7 inch inside leg measurements.
  • Minimal assembly.
  • EAN: 3324604.

143 reviews

Overall rating (4.0)

Build Quality
BazaarVoice TrustMark
1 / 5

Challenge flex bike Appalling

First one went back there was no thread to screw pedal in on one side. Second replacement one went back chain fell off twice within first 1/3 mile - looked at by a knowledgeable friend who said part where chain goes on was faulty - bent Cheap and nasty badly built and designed dont buy Declined to get a third one.

5 / 5

well worth the money

great little bike ideal 4 me 7 mile round trip,live just outside newcastle

4 / 5

Its not a Brompton, but!

It takes a bit of work with an allan key to put it up and down, that apart, within 10 mins of arriving at the seaside with my Granddaughter, we had the bikes up, and enjoyed an hours cycling problem free. Gears and brakes are adequate for the purpose and the ride is OK. Will need a new saddle though, it is a bit hard on my 70 year old backside. All in all, a lot of bang for buck.

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Questions & answers

43 questions | 50 answersAsk a question
What is the maximum weight this bike will support?

I am a 6ft 18stone male and I suspect I am way too heavy for this bike! It would however be ideal to throw in the boot for occasional use as I don't want the added expense of buying a car rack to take a fixed frame model.

1 Answer

15 stone max

is this a good bike to be able to get up hills?

I was wondering if this will get up a hill easily, is it light? any other colors, accessories?

1 Answer


It would depend on your physical stamina on if you would find this easy to get up a hill. I can confirm that this weighs approximately 14KG.
Also, this is the only colour of this bike that we currently stock

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big enough for me

I ,m 32inch leg and 6foot 3inches weigh16+10lbs is itok for me.

1 Answer

not recommended
as my husband is 6ft weighs 15st
and you would not be able to extend the saddle any higher

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Boring but important info

Bike Tyres

The tyres on our bikes are sold partially inflated to prevent damage in transit. You will need to fully inflate the tyres before use.

Prices correct as displayed but are subject to change.

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