New bike build for ...
 

New bike build for Sophie

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 poah
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Sophie has out grown her 24 inch wheel'd road bike so the bike fairies dropped off this Hup Straatrace 37cm frame this morning. Colour is more orange than red which is a bit disappointing but hey ho. 

Will be getting a 1x GRX 810 groupset minus the crank and some Elite wheels (whenever they get delivered).  Got spare wheels so will put them on for the time being.  

Frame is 1390 g
Fork uncut 450 g

Specs say 30mm max tyres but it fits 32 mm without any issue and could go a bit bigger.  

We need to think about stem length though.  34cm Hup bar

 

bought from Kids racing. 

 

 

 

 

 

 

 

 
Posted : 10/04/2025 4:15 pm
slowol, jamiemcf, anorak and 2 people reacted
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Nice! Lucky girl, sounds like it's going to be ace.

I'd advise looking at short reach 105 rather than GRX. The size of rider needing a 37cm could well find the lever reach when changing gear a bit long on GRX. The sram hydro systems are also popular for kids as double tap is easier on little hands.

 
Posted : 10/04/2025 4:34 pm
 poah
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down to cost TBH. Tried her on my 105 and she was fine.  

 
Posted : 10/04/2025 4:54 pm
 poah
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almost finished.  brakes are being a pain though.  clearly road levers only want to accept shimano barbs by the looks of it.  barbs that were fine with the MTB levers not happy in the road lever.  

 
Posted : 11/04/2025 8:53 pm
 poah
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Finished - just have to wait on wheels coming so spare alu ones till they arrive. 

Tyres are Pirelli P zero race TLR with ridenow TPU tubes.

 

 

 
Posted : 12/04/2025 5:47 pm
anorak and integra reacted
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That looks cool - are they 700c wheels or something smaller? Whats the cassette / size of chainring on there?

Is Sophie pleased?

 
Posted : 14/04/2025 7:20 am
 poah
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700c wheel

11-40 casstte

26t chainring. 

 

super happy

 

 

 
Posted : 14/04/2025 10:42 am