Border Bogie Challenge, Denholm, Scottish Borders

Reading your forum I notice a lot of talk about 14mm axles being the minimum to use when stub mounting front wheels Having sourced 3 old mountain bikes I find the axle dia of approx 10mm My question is whats involved with changing these to 14mm as the design we have for the chassis needs stub axle mounted wheels all round Whizbang

Experience suggests that if you stub mount your wheels using 10mm spindles, they will bend and may even shear off completely. 14mm is about the minimum diameter spindles that'll take the loading of an adult plus a reasonably solidly made cartie. 14mm is a common spindle diameter in BMX wheels.

If you've already got MTB wheels on 10mm axles, I'd say your options are fairly limited. You might be able to get the hubs machined out to the take a bigger spindle - not sure if that'd be possible - or perhaps get them re-laced onto some 14mm BMX hubs. Alternatively, change your design and mount the wheels in forks. Last option - forget the MTB wheels and source some BMX wheels on 14mm spindles.

Finally - you don't say how big the wheels are, but I'm guessing 24" or 26" - they'll need to have good strong rims, or they may well buckle. (See about 1 min into this video on youtube for an example).

Good luck!

Hi Everybody. Just like to thank everybody for supporting the first Border Bogie in 2009, the day was a great success especially as we attracted teams for the Braw North and the busy Sooth. Incredible effort went in to the entries and teams who travelled miles to come together to worship the gravity racer. We were all blown away by the standard and build quality and that especially goes for the kid entries whos imagination was inspiring. We were a little nervous about how it would go and I myself with the busy schedule never got a chance to run but it was made up for by the 60 grand Mira Car spinning out of control and hurtling into the bales doing Oh I don't know 10grands worth of damage!! It was ear to ear grins all day for everyone, don't think the Mira car will be returning next year. Next years event will take place on Saturday 22nd of May and will be a similar event to this year with a few niggles ironed out, it will be a great day with many new entries. (capped at 30) more live music, hogroast, camping and general madness. Entry forms can be down loaded from the Border bogie website and entries are being taken from the 1st of January. This year we are hoping to have large screens on the course showing the Bogies leaving the start line and finishing through the Hizzy Bends. We really hope to see some old and new faces next year and welcome all of you to take part. I can be contacted on 01450 870155 or 07887 984845 if you have any questions about next years event. See you soon. Rob Armstrong (Chairman)

Entry forms are now available for download from the Border Bogie web site.

After speaking to th event organisers it looks like there maybe big screen coverage and the police are coming with a radar gun to capture the speed. Mind folks the limit is 30mph.lol

Border Bogie 2010 is only three weeks aay and there are only a handful of spaces left for entries so if anyone out there has not returned their entry form them be quick. Every thing is set for the Borders only downhill event, we have carts, music, food,camping, giant carboot sale, entertainment and awesome villiage pubs to wet the appetite. Looking forward to seeing all of you there. Remember and log onto the Border Bogie website for details. Rob

The Border Bogie challenge is now closed for entries. The forcast is hot and we are looking forward to seeing all of you there. Rob