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PostPosted: Wed Feb 27, 2013 9:09 am 
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Joined: Mon Jan 21, 2008 12:09 pm
Posts: 2311
Any suggestions or feedback? We'll be lowering the stem but will likely leave a bit of extra steerer so my son has room to grow. Also, I'm not happy with the I-links and the Planet-X brakes. Individually they are great. But the i-links don't fit into the cable stops on the brakes which is an issue. New saddle, some red-ano bolts, and wire grommets are on the way. We're probably going to switch to a longer crank... same design but moving from 145mm to 150mm. Otherwise, I can't see anywhere I can make changes without throwing a lot of money at the project.

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TED
Schoorl, Noord-Holland, Nederland
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Posted: Wed Feb 27, 2013 9:09 am 


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PostPosted: Wed Feb 27, 2013 2:28 pm 
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Joined: Mon Feb 19, 2007 3:44 am
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Location: Canada
Nice overall project. The bike looks huge compared to the kid.

Cool crankset ! How much do these cost ? Any link to a manufacturer, or distributor ?

So, finally, bike weight ?.......anywhere near the projected "under 6kg" ?

Louis :)


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PostPosted: Wed Feb 27, 2013 10:19 pm 
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The front end is tall. We need to pull out the giant spacer under the stem. But when you see him on the bike, actually riding, it is a good fit. The top tube is only 49cm.

The crankset runs US$150.00. It is actually a BMX crankset. But I found it works really well with a double chainring. You can find it at http://speedlineparts.com/products/cranks/sx-mini-cranks/. The design is actually licensed from Answer BMX which has the same crank at http://www.answerbmx.com/AnswerMiniCranks.html.

My scale is dead... I think damaged in the move. I'll have to buy/borrow a new one to get the weight. But it feels close to the mark compared to my bike.

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TED
Schoorl, Noord-Holland, Nederland
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English Custom Steel Internal di2
Litespeed Ghisallo


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PostPosted: Wed Feb 27, 2013 10:23 pm 
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Joined: Mon May 30, 2005 7:13 am
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looks happy to be riding it, nicely done!


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PostPosted: Thu Feb 28, 2013 4:04 am 
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Location: Canada
xnavalav8r wrote:
It is actually a BMX crankset. But I found it works really well with a double chainring..


Thanks for the links Ted.

So it's intended for use with a single ring ?
How (any particular placing, or modification) did you install the two chainrings on the crank ?

Very clever. I'll copy you, that's for shure :beerchug:

How tall's Ryder again ? Just for crank arm lenghts comparison with my twin daughters...

Louis :)


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PostPosted: Thu Feb 28, 2013 8:50 am 
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Ryjder is about 140cm tall (roughly 55in). I chose his crank length by measuring his inseam and comparing the proportions to my own. A professional fitter recommended I use a 170mm crank based on my 78.74cm (31in) inseam length. The 145mm crank worked great last year, but he has grown a bit so I have a new, slightly longer crank coming. Unfortunately, I have only been able to find cranks in 5mm increments. As a result, he is moving to a 150mm... but I would prefer he was on a 147.5.

As for modifications. I made a very minor modification to the spider. Using the Extralite 42/30 chainrings on the 104bcd spider is almost perfect. However, the arms extended a bit further beyond the chainring bolt holes than is normal on a road or mtb crank. As a result, the chain tended to make contact with the arms and "lift" 4 times per rotation. I used a Dremel to grind away a bit of the excess material and shaped the ends of the arms to act as lift ramps when shifting. I'll try and post a detail picture later today. To be honest, I am really impressed with the result. It's not very noticable visually, but it really did improve the shifting. Considering I did it by hand, I can't be more pleased with the result. It was about 10 minutes of effort for a huge performance improvement.

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Schoorl, Noord-Holland, Nederland
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English Custom Steel Internal di2
Litespeed Ghisallo


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PostPosted: Thu Feb 28, 2013 10:16 am 
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That is seriously cool!
Congrats on the build

Your son obviously loves his new bike, you cant wipe the smile off his face!

And nothing makes me prouder than riding down the road with my son (12y/o)


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PostPosted: Fri Mar 01, 2013 8:55 am 
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Yeah, we have a lot of fun together on bikes...

Image

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TED
Schoorl, Noord-Holland, Nederland
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English Custom Steel Internal di2
Litespeed Ghisallo


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PostPosted: Mon Apr 01, 2013 1:51 pm 
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Out for a ride along the North Sea Coast... "hurry up dad!"

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TED
Schoorl, Noord-Holland, Nederland
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English Custom Steel Internal di2
Litespeed Ghisallo


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PostPosted: Thu Aug 08, 2013 3:03 pm 
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Here are some long-awaited photos with final updates (upgrades) installed. The ridiculously tall headset bearing cover was replaced with a standard version. I left some extra steerer so the fork can be used on a larger frame as my son grows. The gearing is now KNWU (Dutch cycling federation) legal. I used a 38t chainring up front. There is a pretty big gap between it and the front derailleur, but I can't position the derailleur lower due to the bottle boss being in the position where the clamp would go. It looks funny, but shifting is fine. All wiring grommets are installed. The bike has well over 1000 km so far and my son loves it.

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TED
Schoorl, Noord-Holland, Nederland
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English Custom Steel Internal di2
Litespeed Ghisallo


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PostPosted: Fri Aug 09, 2013 8:00 am 
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Joined: Fri Dec 10, 2004 9:41 am
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Location: FINLAND
Hi
Nice build!
What are KNWU rules for gearing? I mean, with 38 front and 12/13 back you get 6.76/6.24m using 700c/23 wheel. We have max gearing (UCI rules) for kids under 12 -> 5.66m and under 14 -> 6.10m.

My son has felt F95 JR racebike with 650c wheels and 32/38 up front and 13-29 cassette. With this wheel size gearing meters is just under 5.7m (about 5.66m). My son has born 2004 so he is only 9 years old, but he's rather tall 147cm or so.
http://www.pellossalo.fi/content/upload ... G_0573.JPG" onclick="window.open(this.href);return false;

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PostPosted: Fri Aug 09, 2013 8:14 am 
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The rollout limit here is 5.78m.

We're using a 38/30 chainring with 14/27 cassette combo. He can run the 14t cog without the chain making contact with the frame. Anything larger and the chain rubs the seatstay. I made the cassette by using cogs from 2 different cassettes. This gives a REALLY low gear if needed (30x27) but maintains the mid-range accomplished by the almost straight block junior cassette without exceeding the rollout limit of 5.78m.

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Schoorl, Noord-Holland, Nederland
Bike Pics
English Custom Steel Internal di2
Litespeed Ghisallo


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