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Challenge Seiran (USS) blue £650

Printed From: BHPC Forum
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Forum Name: For Sale
Forum Description: Something to sell or give away? Advertise it here
URL: https://forum.bhpc.org.uk/forum_posts.asp?TID=7774
Printed Date: 27 March 2026 at 1:57am
Software Version: Web Wiz Forums 12.07 - https://www.webwizforums.com


Topic: Challenge Seiran (USS) blue £650
Posted By: guy_yeates
Subject: Challenge Seiran (USS) blue £650
Date Posted: 09 March 2025 at 4:44pm
Challenge Seiran (USS, Blue)

Owner is 170cm tall and the bike uses a medium seat with 67cm between the front of seat to bottom bracket. The bike has an extra 8cm of extension available.  Spare parts for the under-seat chain guide included (see attached zip file of images).

Wanting £650

Ideally come and collect. (South Oxfordshire)


Full set of images here (hopefully)...
  https://forum.bhpc.org.uk/uploads/3201/Challenge-Seiran.zip" rel="nofollow - uploads/3201/Challenge-Seiran.zip

Other specs.:
  • Shimano Deore XT hubs, 27 Gears.
  • Shimano Tiagra 165mm cranks. 
  • UnAir Sa Suntour air suspension
  • TRP disk brakes
  • Marathon Plus 40-507 tyres


-------------
Guy Yeates
Owned & ridden:
Haluzak 'Horizon'
Challenge 'Seiran 26'
Schlitter 'Encore'



Replies:
Posted By: Raptobitten
Date Posted: 14 March 2025 at 7:18pm
Guy,
Sieran looks fantastic! I can do a swapsie for a well-specced (though in need of TLC) Nazca Fuego. I bought it for £1,200. I’d get it serviced and a new rear tyre before bringing it to you.

If that’s not of interest I’d want to sell the Nazca first before buying a replacement ‘bent.

Could you comment on:
- weight: is it light? OK on hills?
- speed: is it fast, say, similar to the Challenge Fujin? I recall Challenge making a big fuss about the Sieran before they, um, shut up shop.
- if you know about the Nazca, would you say the Sieran is similar or faster?


As for the Nazca
- it’s very fast on the flat - easily outpaces any roadie on his carbon thingy.
- not great uphill (heavy)
- a comfortable ride. I like it a lot. I just want to try something different and faster uphill (I’m moving to hilly Dorset).

All the best
Richard
Richardl@activeplanning.co.uk


Posted By: guy_yeates
Date Posted: 15 March 2025 at 10:53am
Hi Richard, 

I'm actually exiting the recumbent scene having been riding them since 1996 but got back onto up-wrongs 4 years ago so I can't do a swap. I used the Challenge for commuting but did use it for CTC rides where hills were involved and yes you can ride up a 10% (average) if the legs are on for a 10% hill it's aluminium frame but not the heaviest of bikes at 17.8 Kg. It felt similar to a Hurricane but I think wheel size is a factor as to how fast it feels. If you can swap over to above seat steering the improvement in aerodynamics may get it close to an aluminium Fujian. I swapped out the spring suspension for gas and that improved the weight by >1Kg.

Guy  
(I'll repeat this in a direct email)




-------------
Guy Yeates
Owned & ridden:
Haluzak 'Horizon'
Challenge 'Seiran 26'
Schlitter 'Encore'


Posted By: AndyW
Date Posted: 24 June 2025 at 7:11am
Hi Guy,

Is your Seiran still for sale?

AndyW


Posted By: guy_yeates
Date Posted: 24 June 2025 at 12:12pm
Hi Andy,

yes indeed it is. 

I'm based on South Oxfordshire (Didcot).

Guy




-------------
Guy Yeates
Owned & ridden:
Haluzak 'Horizon'
Challenge 'Seiran 26'
Schlitter 'Encore'


Posted By: AndyW
Date Posted: 24 June 2025 at 3:24pm
Hi Guy,

I'm in Abingdon. Could I come and have a look? I could do this afternoon / evening if that suits you.

Andy


Posted By: guy_yeates
Date Posted: 24 June 2025 at 9:45pm
Hi Andy,

sorry I  missed you email. I'm in from 5:30 pm all week and I'm around all weekend.
I'll send you my contact details.
Guy


-------------
Guy Yeates
Owned & ridden:
Haluzak 'Horizon'
Challenge 'Seiran 26'
Schlitter 'Encore'


Posted By: guy_yeates
Date Posted: 25 June 2025 at 9:53pm
now sold.

-------------
Guy Yeates
Owned & ridden:
Haluzak 'Horizon'
Challenge 'Seiran 26'
Schlitter 'Encore'



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