You don't need to be an 'investor' to invest in Singletrack: 6 days left: 95% of target - Find out more
Hi everyone,
Hoping someone can help as I don't understand the full impact of offset. I've ordered a new 29er DH frame and consequently need to buy all the bits, including the forks.
On my current 27.5 DH forks, I have a set of BOS Idylle FCVs, which I absolutely love. I know BOS have had their aftercare issues, but I've never had a problem and feel the damping is second to none. I've found a way to get hold of a set of new 29er Idylle 39s but the thing stopping me from pushing the button is that the offset is 53.5.
Other DH forks have a lower offset, e.g. the Fox 40 has an offset of 52. For Ohlins you purchase the crowns to choose the offset, from what I understand the sweet spot is about 50.
Will this be a huge problem or am I worrying about nothing?
Thanks in advance
Firstly, no it won't make a difference.
Secondly, you bought a DH bike and you don't even tell us what it is? All we get around here on NBD is gravel bikes.
Pics appreciated.
Thanks for the reply,
It hasn't arrived yet, but its one of these:
Bit of an impulse buy, but should be good!
Shame the new Idylles are not 40mm, then I could have just got a sec of the Mojo crowns, but being 39mm I'm kind of out of options
Steering will be lighter/less stable than with a shorter offset fork, but as you won’t know any different (having not ridden a shorter offset fork on that frame), you’re unlikely to notice anything untoward.
Speaking of crowns, you're not a dentist are you. 😃
Sorry couldn't resist, that was lame even for me.
I wouldn't worry about 3.5mm, av fork flexes more than that fore-aft while riding. If you go 43mm to 45mm on a road bike it's really hard to say if there's any noticeable effect on handling (I don't think there is).
Steering will be lighter/less stable than with a shorter offset fork,
Other way round.. More offset = less trail = lighter steering
Wow good work, that's a mad looking bike!
I loved my Bos suspension when I had a YT Tues nearly 10 years ago but I reckon you'd be brave to run it now. I didn't even realise they still made MTB stuff. It worked like magic at the time but spares and servicing was totally unavailable. Not sure if the situation has gotten any better.
If I was building a DH bike I'd try to spring the cash for an Ohlins DH38. I think that would see me to the end of my DH career.
From the few people who still ride DH bikes, modern ones with big wheels, I gather that shorter offset is preferable. I wish I had some personal experience to offer.
One useful point to absorb is that a dual crown fork “needs” different offset to a single because it flexes less. This was confirmed by Marcel the Mojo / Geometron industrial design guy.
Lots of teams took on the Mojo MORC as I understand it. Less offset = more stability. I guess Fox and Rockshox have caught up now. Maybe not BOS tho. I loved my Vip’r S**Toy Idylle SC and their Deville air fork. I was quite the NOS fanboy.
Servicing, though, was sporadic. J Tech can do it, luckily, but I don’t know about spares.
It amazed me that BOS binned R54 when they had so much expertise.
Jonesy used to wax lyrical about BOS but that stopped long ago.
EXT seem to have stepped into the ring as masters nowadays.
Good luck with the new bike.
Thanks everyone,
I actually spoke to Mojo today regarding something else so thought I'd ask them the same question. They reckon that in layman's terms it will make the bike feel twitchy and less stable, especially during leaning for cornering. They said they wouldn't personally sacrifice superior damping for this.
Something for me to think about...I'm not racing or anything so superior damping over rough terrain is still appealing.
@sillyoldman apologies yes, "than with.." - sometimes I read something and just don't see a word, like there..